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 = "..";`

Boards/Simulator/Source/hal/SdlKeyboard.h

@@ -4,20 +4,20 @@
 #include <Tactility/TactilityCore.h>
 
 class SdlKeyboard final : public tt::hal::keyboard::KeyboardDevice {
-private:
+
     lv_indev_t* _Nullable handle = nullptr;
 
 public:
 
-    std::string getName() const final { return "SDL Keyboard"; }
-    std::string getDescription() const final { return "SDL keyboard device"; }
+    std::string getName() const override { return "SDL Keyboard"; }
+    std::string getDescription() const override { return "SDL keyboard device"; }
 
-    bool start(lv_display_t* display) override {
+    bool startLvgl(lv_display_t* display) override {
         handle = lv_sdl_keyboard_create();
         return handle != nullptr;
     }
 
-    bool stop() override { tt_crash("Not supported"); }
+    bool stopLvgl() override { tt_crash("Not supported"); }
 
     bool isAttached() const override { return true; }