Touch and display driver subsystems reworked (and more) (#302)

- Refactored `TouchDevice`: it can now start/stop LVGL separately, and it has an optional `TouchDriver` interface
- Refactored `DisplayDevice`: it can now start/stop LVGL separately, and it has an optional `DisplayDriver` interface
- Updated all boards and drivers for above changes
- LVGL can now be stopped and (re)started on the fly
- Fixed issues with restarting Gui and Statusbar services
- Refactored `Gui` service to be class and renamed `Gui` to `GuiService`
- Fixed `Statusbar` service: forgot to deregister one of the icons
- Updated `esp_lcd_st7701` to v1.1.3
- `lv_textarea_create()` now automatically registers the hardware keyboard hooks (by wrapping the function)
- Fixed and updated `tactility.py`
- Cleanup of a lot of code
- `BootInitLvglBegin` and `BootInitLvglEnd` are replaced by `LvglStarted` and `LvglStopped`.
- Introduced `tt::service::State` which is accessible via `tt::service::getState()` (and internally via `ServiceInstance`)
- Started replacing `#define TAG` with `constexpr auto TAG = "..";`

Tactility/Source/hal/Hal.cpp

@@ -39,12 +39,12 @@ void init(const Configuration& configuration) {
         if (!configuration.sdcard->mount(TT_SDCARD_MOUNT_POINT)) {
             TT_LOG_W(TAG, "SD card mount failed (init can continue)");
         }
-        hal::registerDevice(configuration.sdcard);
+        registerDevice(configuration.sdcard);
     }
 
     if (configuration.power != nullptr) {
-        std::shared_ptr<tt::hal::power::PowerDevice> power = configuration.power();
-        hal::registerDevice(power);
+        std::shared_ptr<power::PowerDevice> power = configuration.power();
+        registerDevice(power);
     }
 
     kernel::publishSystemEvent(kernel::SystemEvent::BootInitHalEnd);