feat: Added automatic loading of Apps from the macropad_apps/python directory at load time.

Performance improvements to the lighting system.
Renamed app_router to macropad_os.

macropad_os/__init__.py

@@ -2,4 +2,4 @@ from .serial_communications import SerialComms
 from .configuration import Config, ConfigItem
 from .app_state import AppState, InvalidStateUpdateError
 from .abstract_app import App
-from .app_router import AppRouter
+from .macropad_os import MacropadOS