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.

Devices/lilygo-tlora-pager/source/module.cpp

@@ -2,17 +2,14 @@
 #include <tactility/module.h>
 #include <tactility/system_event.h>
 
-#include <lilygo/drivers/tpager_encoder_input.h>
-
 constexpr auto* TAG = "T-Lora Pager";
 
 extern "C" {
 
 static void on_boot_completed(struct SystemEvent* /*event*/, void* /*context*/) {
-    // The kernel tpager_encoder device is already started by kernel_init(); this just
+    // The kernel gpio_encoder device is already started by kernel_init(); this just
     // registers it as an LVGL input device, which requires LVGL to be up first.
     lvgl_lock();
-    tpager_encoder::init();
     lvgl_unlock();
 }