gestures: Add support for wayland sessions.

[mtwebster]

Unfortunately the way relevant events are handled in muffin differs
enough between session types that we need to keep touchegg support
for x11, at least for now.

• Refactor the GesturesManager to support both touchegg and native
  clutter/libinput events.
• Actual gesture actions behavior are unchanged.
• Port actions to use js/misc/mprisPlayer, remove gestures-specific
  mpris code
• Use Main.screensaverController for locked state tracking.

Todo:

• Touchpad gestures work only if the touchpad is enabled. This would
  seem logical, but is only the case for Wayland - in x11, gestures
  work regardless.
• Only tested with touchpads so far. Need to test touchscreen
  behavior.

ref: linuxmint/wayland#99

[github-actions]

Best-practices scanner

This is a regex-based check for API usage that can pose security, performance or
maintainability issues, or that may already be provided by Cinnamon. Having code flagged
by it doesn't automatically disqualify a pull request.

This check is not perfect will not replace a normal review.

---

Found 2 potential issue(s):

⚠️ raw_mpris_dbus

js/misc/mprisPlayer.js:543

//   org.mpris.MediaPlayer2.name.instanceXXXX

(Cinnamon 6.8) Use imports.misc.mprisPlayer.getMprisPlayerManager() for a high-level API
that automatically discovers and tracks MPRIS players, handles proxy setup,
and provides playback control, metadata, and capability accessors.
For lower-level access, use imports.misc.interfaces.getDBusProxyWithOwner().

js/misc/mprisPlayer.js:545

//   org.mpris.MediaPlayer2.name-XXXX

(Cinnamon 6.8) Use imports.misc.mprisPlayer.getMprisPlayerManager() for a high-level API
that automatically discovers and tracks MPRIS players, handles proxy setup,
and provides playback control, metadata, and capability accessors.
For lower-level access, use imports.misc.interfaces.getDBusProxyWithOwner().

---

Automated pattern check.