Update to LVGL 9.0.0 (#47)

- Updated LVGL from 8.3 to 9.0 (removed example/docs/demo folders)
- Updated esp_lvgl_port  to current status of the `lvgl9` branch on `esp-bsp`: https://github.com/espressif/esp-bsp/tree/lvgl9
- Updated all boards and drivers
- Removed `libs/lv_drivers` subproject as SDL is now supported by LVGL directly (although keyboard input seems broken)
- Updated `libs/lv_screenshot`
- Fixed the way `tt_statusbar` widget works due to behaviour change in LVGL
- Updated other lvgl code

boards/lilygo_tdeck/display_i.h

@@ -1,13 +1,13 @@
 #pragma once
 
-#include "hal/lv_hal_disp.h"
+#include "lvgl.h"
 #include <stdbool.h>
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-lv_disp_t* tdeck_display_init();
+lv_display_t* tdeck_display_init();
 
 bool tdeck_backlight_init();