Updated to Vim 9.1.0

Vim 9.1 is now released! See
[announcement](https://www.vim.org/vim-9.1-released.php).

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

System monospace font (SF Mono)
--------------------

MacVim's `guifont` option now supports a new `-monospace-` value, which
instructs it to use the system monospace font, which is SF Mono in
recent macOS versions. As mentioned below, you can now use
tab-completion to see the available values in cmdline. See `:h
macvim-guifont` for more details on how to use it (including using
different font weights). #1463

Note: I'm contemplating changing the MacVim defaults to use
`-monospace-` in the future so MacVim will always use the native
monospace font instead of being hard-coded to Menlo. This makes it more
consistent with Apple Terminal and Xcode. Feel free to leave a comment
on #1277 if you have opinions on this.

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

- Command-line tab completion improvements and bug fixes
    - Most string option values can now be completed. v9.0.1958
    - MacVim options (guifont, fuoptions) also support tab completion.
      #1436
    - ++opt (e.g. `:e ++`) and `:terminal ++` completion works as well.
      v9.0.2025
- New options:
    - `set jumpoptions=stack`. Ported from Neovim. v9.0.1921
- API changes
    - `getmousepos()` returns a new "coladd" for tab characters.
      v9.0.2032
- `:Man` now works properly when `gdefault` is set.
- A new small Vim script library that may expand in the future. See `:h
  vim-script-library`.
- Vim9 script improvements.
- Miscellaneous security fixes.

Misc
--------------------

New settings:

- "Scroll in one direction only" (Input). Prevents accidental horizontal
  scrolling when scrolling vertically using a trackpad. #1442

Clean mode (#1453):

- Vim can be opened in clean mode (does not use .vimrc or plugins) via
  the new menu item "New Clean Window". The new menu isn't localized in
  most languages. Please comment on the issue if you would like to help
  in localization.
- MacVim can be launched without loading user defaults for a clean
  experience via a command-line flag. See `:h macvim-settings`.

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

- Sparkle (updater for MacVim) is now updated to 2.5.2. The updater can
  now show multiple release notes when updating MacVim across multiple
  versions. #1446 #1469
- Binary release is now built with more optimized compiler settings. Vim
  will now run slightly faster than before. #1444
- macOS 14 Sonoma:
    - Binary release is now built using the macOS 14 SDK (#1434, #1440,
      #1448). One small change is that very tall characters (e.g. "นี้")
      on the first line will now draw into the title bar instead of
      being clipped.
    - Fixed printing with `:hardcopy` under macOS 14. *NOTE:* Starting
      from macOS 14, you have to install `ps2pdf` (available from
      Ghostscript) yourself before you can print. See #1464
- Python 2 support: The default location for locating the Python 2 lib
  in the binary release is now under /Library/Frameworks rather than
  /usr/local. Note: Python 2 has long been obsolete. If you rely on
  Python 2 plugins, consider this a warning as it's only supported as
  long as it's feasible and could be removed in the future. #1434

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

- Fixed non-native full screen mode when using a MacBook with a notch
  and having the "Show menu bar in non-native mode" option set. Changing
  the screen resolution while using non-native full screen also works
  properly now. #1450
- Fixed Help menu's documentation search not working with tags with
  special characters like `<Down>`. #1455

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 3.9 or above
- Ruby 3.2