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.c

@@ -44,7 +44,7 @@ void tdeck_backlight_set(uint8_t duty) {
     }
 }
 
-lv_disp_t* tdeck_display_init() {
+lv_display_t* tdeck_display_init() {
     const esp_lcd_panel_io_spi_config_t panel_io_config = {
         .cs_gpio_num = TDECK_LCD_PIN_CS,
         .dc_gpio_num = TDECK_LCD_PIN_DC,
@@ -134,10 +134,12 @@ lv_disp_t* tdeck_display_init() {
         .flags = {
             .buff_dma = false,
             .buff_spiram = true,
+            .sw_rotate = false,
+            .swap_bytes = true
         }
     };
 
-    lv_disp_t* display = lvgl_port_add_disp(&disp_cfg);
+    lv_display_t* display = lvgl_port_add_disp(&disp_cfg);
 
     return display;
 }