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.cpp

@@ -161,7 +161,7 @@ void TpagerKeyboard::processKeyboard() {
     }
 }
 
-bool TpagerKeyboard::start(lv_display_t* display) {
+bool TpagerKeyboard::startLvgl(lv_display_t* display) {
     backlightOkay = initBacklight(BACKLIGHT, 30000, LEDC_TIMER_0, LEDC_CHANNEL_1);
     initEncoder();
     keypad->init(KB_ROWS, KB_COLS);
@@ -195,7 +195,7 @@ bool TpagerKeyboard::start(lv_display_t* display) {
     return true;
 }
 
-bool TpagerKeyboard::stop() {
+bool TpagerKeyboard::stopLvgl() {
     assert(inputTimer);
     inputTimer->stop();
     inputTimer = nullptr;