* Boot splash and more
- Added developer sdkconfig
- Refactored the way FreeRTOS includes are included
- Improved Gui/Loader logic
- Implemented boot app with splash screen
* Updated naming for Gui and Loader services
* Renamed Screenshot service methods
* Renames
* Service renames
- 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
- Implemented GPIO app
- LVGL now allocates freely (as opposed to using a fixed-size buffer): when it goes OOM, it just deletes image cache and starts behaving erratically.
