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/lvgl/Keyboard.cpp

@@ -1,20 +1,33 @@
 #include "Tactility/lvgl/Keyboard.h"
-#include "Tactility/service/gui/Gui.h"
+#include "Tactility/service/gui/GuiService.h"
+
+#include <Tactility/service/espnow/EspNowService.h>
 
 namespace tt::lvgl {
 
 static lv_indev_t* keyboard_device = nullptr;
 
 void software_keyboard_show(lv_obj_t* textarea) {
-    service::gui::softwareKeyboardShow(textarea);
+    auto gui_service = service::gui::findService();
+    if (gui_service != nullptr) {
+        gui_service->softwareKeyboardShow(textarea);
+    }
 }
 
 void software_keyboard_hide() {
-    service::gui::softwareKeyboardHide();
+    auto gui_service = service::gui::findService();
+    if (gui_service != nullptr) {
+        gui_service->softwareKeyboardHide();
+    }
 }
 
 bool software_keyboard_is_enabled() {
-    return service::gui::softwareKeyboardIsEnabled();
+    auto gui_service = service::gui::findService();
+    if (gui_service != nullptr) {
+        return gui_service->softwareKeyboardIsEnabled();
+    } else {
+        return false;
+    }
 }
 
 void software_keyboard_activate(lv_group_t* group) {
@@ -37,8 +50,4 @@ void hardware_keyboard_set_indev(lv_indev_t* device) {
     keyboard_device = device;
 }
 
-void keyboard_add_textarea(lv_obj_t* textarea) {
-    service::gui::keyboardAddTextArea(textarea);
-}
-
 }