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

libs/lvgl/scripts/jpg_to_sjpg.py

@@ -1,3 +1,5 @@
+#!/usr/bin/env python3
+
 ##################################################################
 # sjpeg converter script version 1.0
 # Dependencies: (PYTHON-3)
@@ -113,7 +115,7 @@ for i in range(len(sjpeg)):
         new_line_threshold = 0
 
 
-c_code = c_code + "\n};\n\nlv_img_dsc_t "
+c_code = c_code + "\n};\n\nlv_image_dsc_t "
 c_code = c_code + OUTPUT_FILE_NAME + " = {\n"
 c_code = c_code + "\t.header.always_zero = 0,\n"
 c_code = c_code + "\t.header.w = " + str(width) + ",\n"