Adds a new request called `ProcessHotkeyByName` which calls the routine
associated with a given hotkey. The hotkey is identified by the unique
name set while registering it. Works with both OBS default hotkeys and
hotkeys added by plugins/scripts.

Adds a new request called `ProcessHotkeyByCombination` which calls the
routine associated with a given hotkey. The hotkey is identified by the
combination of keys set by the user to trigger it. Multiple routines
are called if the same combination is bound to different hotkeys.