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

sdkconfig.board.yellow_board

@@ -6,9 +6,9 @@ CONFIG_LV_USE_FS_STDIO=y
 CONFIG_LV_FS_STDIO_LETTER=65
 CONFIG_LV_FS_STDIO_PATH=""
 CONFIG_LV_FS_STDIO_CACHE_SIZE=4096
-CONFIG_LV_USE_PNG=y
-CONFIG_LV_MEM_CUSTOM=y
-CONFIG_LV_MEM_CUSTOM_INCLUDE="stdlib.h"
+CONFIG_LV_USE_LODEPNG=y
+CONFIG_LV_USE_BUILTIN_MALLOC=n
+CONFIG_LV_USE_CLIB_MALLOC=y
 CONFIG_FREERTOS_HZ=1000
 CONFIG_FREERTOS_TASK_NOTIFICATION_ARRAY_ENTRIES=2
 CONFIG_PARTITION_TABLE_CUSTOM=y
@@ -23,7 +23,6 @@ CONFIG_ESP32_DEFAULT_CPU_FREQ_240=y
 CONFIG_ESPTOOLPY_FLASHSIZE_4MB=y
 CONFIG_FLASHMODE_QIO=y
 # LVGL
-CONFIG_LV_COLOR_16_SWAP=y
 CONFIG_LV_DISP_DEF_REFR_PERIOD=17
 CONFIG_LV_INDEV_DEF_READ_PERIOD=17
 CONFIG_LV_DPI_DEF=160