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 = "..";`

Drivers/CST816S/Source/Cst816Touch.h

@@ -1,9 +1,8 @@
 #pragma once
 
-#include <Tactility/hal/touch/TouchDevice.h>
-#include <esp_lcd_touch.h>
+#include <EspLcdTouch.h>
 
-class Cst816sTouch final : public tt::hal::touch::TouchDevice {
+class Cst816sTouch final : public EspLcdTouch {
 
 public:
 
@@ -54,16 +53,18 @@ private:
 
     void cleanup();
 
+    bool createIoHandle(esp_lcd_panel_io_handle_t& ioHandle) override;
+
+    bool createTouchHandle(esp_lcd_panel_io_handle_t ioHandle, const esp_lcd_touch_config_t& configuration, esp_lcd_touch_handle_t& touchHandle) override;
+
+    esp_lcd_touch_config_t createEspLcdTouchConfig() override;
+
 public:
 
     explicit Cst816sTouch(std::unique_ptr<Configuration> inConfiguration) : configuration(std::move(inConfiguration)) {
         assert(configuration != nullptr);
     }
 
-    std::string getName() const final { return "CST816S"; }
-    std::string getDescription() const final { return "I2C touch driver"; }
-
-    bool start(lv_display_t* display) override;
-    bool stop() override;
-    lv_indev_t* _Nullable getLvglIndev() override { return deviceHandle; }
+    std::string getName() const override { return "CST816S"; }
+    std::string getDescription() const override { return "CST816S I2C touch driver"; }
 };