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/waveshare_s3_touch/display_i.h

@@ -1,6 +1,6 @@
 #pragma once
 
-#include "hal/lv_hal_disp.h"
+#include "lvgl.h"
 #include <stdbool.h>
 #include <stdint.h>
 
@@ -11,7 +11,7 @@ extern "C" {
 bool ws3t_display_lock(uint32_t timeout_ms);
 void ws3t_display_unlock(void);
 
-lv_disp_t* ws3t_display_create();
+lv_display_t* ws3t_display_create();
 void ws3t_display_destroy();
 
 #ifdef __cplusplus