Minor menu fixes (backgrounds; performance for large dynamic menus; PBL_BW icon inversions).
Major button improvements (latency improvements; better behavior for long-presses and repeat-presses; better separation between overlay buttons and app buttons).
Flash stability improvements (properly aligning writes for asterix, and driver fixes for snowy that use the new write alignment logic).
New icons by @piggehperson.
Bug fixes for overlay.
Notifications! New notification app on the home screen that can render slugs of notifications, as well as fullscreen scrollable notifications (design also by @piggehperson). New notification overlay window that uses scrollable notifications renderer.
OK here it is. Lots of changes, but in short: