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/LilygoTLoraPager/Source/hal/TpagerKeyboard.h

@@ -1,6 +1,5 @@
 #pragma once
 
-#include <Tactility/TactilityCore.h>
 #include <Tactility/hal/keyboard/KeyboardDevice.h>
 
 #include <Tca8418.h>
@@ -10,10 +9,7 @@
 
 #include <Tactility/Timer.h>
 
-
-class TpagerKeyboard : public tt::hal::keyboard::KeyboardDevice {
-
-private:
+class TpagerKeyboard final : public tt::hal::keyboard::KeyboardDevice {
 
     lv_indev_t* _Nullable kbHandle = nullptr;
     lv_indev_t* _Nullable encHandle = nullptr;
@@ -36,13 +32,13 @@ private:
 public:
 
     TpagerKeyboard(std::shared_ptr<Tca8418> tca) : keypad(std::move(tca)) {}
-    ~TpagerKeyboard() {}
 
-    std::string getName() const final { return "T-Lora Pager Keyboard"; }
-    std::string getDescription() const final { return "I2C keyboard with encoder"; }
+    std::string getName() const override { return "T-Lora Pager Keyboard"; }
+    std::string getDescription() const override { return "T-Lora Pager I2C keyboard with encoder"; }
+
+    bool startLvgl(lv_display_t* display) override;
+    bool stopLvgl() override;
 
-    bool start(lv_display_t* display) override;
-    bool stop() override;
     bool isAttached() const override;
     lv_indev_t* _Nullable getLvglIndev() override { return kbHandle; }