This is to prepare for adding Sparkle 2 support and using a symlink lets
us switch between the two depending on what macOS version we are
targeting.

This adds Sparkle 2 to the project add changes the symlink to point to
it. This version has changed the min OS requirement from 10.9 to 10.13,
and as such we keep the old Sparkle 1 around, and during CI, we swap to
it when building legacy binary (regular MacVim has minOS set to 10.13,
while legacy has min OS set to 10.9).

Add a configure flag to set the USE_SPARKLE_1 ifdef flag. In CI legacy
builds, we will relink the symlink to point to Sparkle_1.framework and
also call that configure flag so the code will build.

Use the updated API (SPUStandardUpdaterController instead of SUUpdater).
Old functionality now use a USE_SPARKLE_1 compiler define to switch to
old behavior when building for legacy builds.

Add a delegate class that we can use to customize Sparkle behavior.

Also, make sure DISABLE_SPARKLE will prevent including headers as well
- Previously it was a mistake to keep including the headers. Now it should
be completely de-coupled.

Add a new option for the user to opt-in for getting pre-release
software. When turned on, Sparkle will accept a new "prerelease" channel
for updates.

This feature only works in Sparkle 2, which means legacy binaries
(10.9-10.12) which use Sparkle 1 won't get this. It's possible to
implement this for Sparkle 1 but we would need to do so in a completely
different (and more annoying) manner of using two separate appcast XML
files and switch among them. Given the niche nature of legacy binaries,
this is not worth doing.

The setting is in the Advanced settings pane because the pre-release
builds aren't guaranteed to be stable or well-tested, so we don't want
users to turn it on unless they looked for it. For terminology, went
back and forth on "beta", "preview", "pre-release", and eventually
settled on "pre-release" builds which also lines up with GitHub
Release's convention.

Updated to Vim 9.0.1276

Features
====================

Dictionary lookup
--------------------

You can now use Force Touch or Cmd-Ctrl-D to look up definitions of word
under the cursor (or selected text in visual mode). This will also
preview URLs, and support data types such as phone numbers and
addresses. #1312 #1313

This feature can also be invoked programmatically from VimScript (see
`:h macvim-lookup`). #1315

Tool bar / Touch Bar / menu icons
--------------------

You can now use SF Symbols for Tool bar and Touch Bar icons, including
using different symbol styles such as "palette" or "multicolor". Menu
items can now also use the `icon=` syntax to specify icons as well. See
`:help macvim-toolbar-icon` for details. #1329

The default tool bar also has updated icons to look similar to SF
Symbols used by newer macOS versions. #1214 by @sfsam

Window management actions
--------------------

There are new `macaction`'s for managing the MacVim window. The new
`zoomLeft`/`zoomRight` actions allow you to pin the window to the
left/right of the screen, and there are also new actions for interacting
with Stage Manager (requires macOS 13+). See `:h macvim-actions` for
details. #1330

Pre-release updates / Sparkle 2
--------------------

MacVim now supports pre-release software builds. It's sometimes hard for
us to release frequent updates due to the desire to pick a stable
upstream Vim version, needing to test the release on multiple OS
versions, making sure there aren't half-complete or buggy features, and
other reasons.

This new feature now allows us to push pre-release beta builds out in a
more frequent fashion, which could be useful if there are particular
features or fixes that you would like to try out before the next
official release. Pre-release builds will be released depending on bug
fixes and features instead of a fixed cadence. Do note that these
pre-release builds may not be as well-validated and may have half-baked
features.

If you are using the built-in auto-updater to update MacVim, you can
turn this on by going to Advanced settings pane, and enable "Enable
pre-release software updates".

This feature is only available for macOS 10.13 or above.

The auto-updater has also been updated from Sparkle 1.27.1 to 2.3.0 for
10.13+ builds. Legacy (10.9-10.12) builds are still using Sparkle 1.

See #1332.

New Vim features
--------------------

New `smoothscroll` option allows you to scroll through a long wrapped
line (using Ctrl-E or mouse wheel) without immediately jumping to the
next line. (v9.0.0640)

`splitscroll` option has been renamed `splitkeep`, with more flexibility
than before. (v9.0.0647)

Sound playback on macOS is now supported. You can use `has('sound')` to
check. See `help sound` for details. (v9.0.0694)

Terminals now support `:confirm` for `:q`, etc, which also means
MacVim's Cmd-W will work properly for terminal windows. (v9.0.0710)

Virtual text had numerous bugs fixed.

General
====================

Legacy build for 10.9 - 10.12
--------------------

Per a previous announcement (#1271), the default MacVim binary will now
require macOS 10.13 or above. Users of macOS 10.9 - 10.12 can use a
separate "legacy" build which will still be supported. The legacy binary
will still have the latest versions of Vim and be supported, but may not
have all the latest features (e.g. pre-release builds).

If you are using the auto-updater (Sparkle) to update MacVim, it should
"just work" and find the best version for you. If you are downloading
MacVim from the website, there is also a link to download the legacy
version marked for 10.9+ as well. If you download the normal binary
marked for 10.13+ from the website, it won't work on these older macOS
versions.

See #1331.

Fixes
====================

CoreText Renderer clipping and rendering bugs
--------------------

Unicode characters with multiple composing characters (e.g. "x⃗") will
now render correctly. #1172

Texts (e.g. Tibetan, Zalgo texts) that are taller than the line height
will no longer be clipped inappropriately. You can use a new setting
`MMRendererClipToRow` to re-enable clipping if the tall texts are
distracting. #995 / #1356

Tab crash
--------------------

Fixed a crash when opening new tabs that seems to only occur in macOS 13
Ventura. #1333

Other bugs
--------------------

- Fixed non-native full screen not working well with the notch on newer
  MacBook's when set to not show menu bar. You can also use
  `MMNonNativeFullScreenSafeAreaBehavior` to force MacVim to use the
  notch area as well if you don't mind some content being obscured. Note
  that the previous release also claimed it fixed this, but because the
  binary was built against an old macOS SDK (Big Sur), the fix did not
  work in the binary release. #1261
- Allow "Open untitled window: never" and "After last window closes:
  Quit MacVim" to be set together again. Added safeguards to make sure
  doing so won't immediately close the app. #1338
- Edit.Cut / Copy menu items will now be properly disabled when there
  isn't selected text. #1308
- Fixed potential `:emenu` crash when the menu is associated with an
  action in a non-valid mode. #1305
- Fixed bug where just bringing up the right-click (or the
  MacVim→Services) menu would somehow copy the selected texts to the
  system clipboard. #1300
- Fixed a Japanese input method bug where using left/right arrow to move
  to a different section of the input text would previously result in
  the candidate list not showing up at the correct position. #1312
- Fix non-CoreText renderer not handling text styles like strikethrough
  correctly (note: this renderer has been deprecated for a while and you
  should not use it). #1296
- This release uses an older sh/bash syntax file because the latest one
  in Vim has a bug. #1358

Misc
====================

New settings:

- "No drop shadows" (Appearance). #1301
- "Treat Ctrl-click as right-click" (Input) (#1326). This was previously
  configurable via command-line, but now also possible in the settings
  pane under the new "Input" category.

"About MacVim" now reports the version number in a clearer way with
clearly specified release number vs Vim version.

Known Issues
====================

Printing
--------------------

Printing using File→Print or `:hardcopy` is currently not working under
macOS 13 Ventura due to its removal of PostScript support in the Preview
app. This will be fixed in a later release. See the issue for
workarounds. #1347

Scripting
====================

- Scripting languages versions:
    - Perl is now built against 5.30, up from 5.18.
    - Ruby is now built against 3.2, up from 3.1.

Compatibility
====================

Requires macOS 10.9 or above. (10.9 - 10.12 requires downloading a
separate legacy build)

Script interfaces have compatibility with these versions:

- Lua 5.4
- Perl 5.30
- Python2 2.7
- Python3 3.10
- Ruby 3.2