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 = "..";`

TactilityC/Source/tt_init.cpp

@@ -38,7 +38,7 @@ extern double __muldf3 (double a, double b);
 extern double __divdf3 (double a, double b);
 extern int __nedf2 (double a, double b);
 
-const struct esp_elfsym elf_symbols[] {
+const esp_elfsym elf_symbols[] {
     // Hidden functions work-around
     ESP_ELFSYM_EXPORT(_ZdlPvj), // new?
     ESP_ELFSYM_EXPORT(_Znwj), // delete?
@@ -139,7 +139,6 @@ const struct esp_elfsym elf_symbols[] {
     ESP_ELFSYM_EXPORT(tt_lvgl_software_keyboard_deactivate),
     ESP_ELFSYM_EXPORT(tt_lvgl_hardware_keyboard_is_available),
     ESP_ELFSYM_EXPORT(tt_lvgl_hardware_keyboard_set_indev),
-    ESP_ELFSYM_EXPORT(tt_lvgl_keyboard_add_textarea),
     ESP_ELFSYM_EXPORT(tt_lvgl_toolbar_create),
     ESP_ELFSYM_EXPORT(tt_lvgl_toolbar_create_for_app),
     ESP_ELFSYM_EXPORT(tt_message_queue_alloc),

TactilityC/Source/tt_lvgl_keyboard.cpp

@@ -30,8 +30,4 @@ void tt_lvgl_hardware_keyboard_set_indev(lv_indev_t* device) {
     tt::lvgl::hardware_keyboard_set_indev(device);
 }
 
-void tt_lvgl_keyboard_add_textarea(lv_obj_t* textarea) {
-    tt::lvgl::keyboard_add_textarea(textarea);
-}
-
 }