Fixes and improvements (#620)

- Standardized keyboard input using Unicode-based key codes across supported devices and the simulator. Keyboards don't emit `LV_KEY_*` anymore.
- Refactored lilygo encoder driver into a reusable GPIO rotary encoder driver (see `Drivers/gpio-encoder-module/`). Added more features to the config file.
- Improved LVGL keyboard device management, including duplicate prevention and reliable reconnects.
- LVGL file mutex now registers with lvgl start/stop
- Improved LVGL startup/shutdown stability and memory allocation reliability.
- Increased simulator LVGL memory capacity and improved USB device-class handling.

Drivers/lilygo-module/source/module.cpp

@@ -6,12 +6,10 @@ extern "C" {
 
 extern Driver tdeck_keyboard_driver;
 extern Driver tdeck_keyboard_backlight_driver;
-extern Driver tpager_encoder_driver;
 
 static Driver* const lilygo_drivers[] = {
     &tdeck_keyboard_driver,
     &tdeck_keyboard_backlight_driver,
-    &tpager_encoder_driver,
     nullptr
 };