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/env_support/pikascript/README.md

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+# PikaScript Binding for LVGL
+
+[PikaScript](https://github.com/pikasTech/pikascript) is an ultralightweight python engine that can run with 4KB of RAM and 32KB of Flash (such as STM32G030C8 and STM32F103C8), and is very easy to deploy and expand.
+
+More details to see: [PikaScript and lvgl: Make Python Lighter, Easier and Smarter](https://blog.lvgl.io/2022-08-24/pikascript-and-lvgl)
+
+The available Python APIs are in the `pika_lvgl.pyi`, and you need copy the `pika_lvgl.pyi` to the root path of pikascript, then `import pika_lvgl` in `main.py`.
+
+The available simulation project on windows:  https://github.com/pikasTech/lv_pikascript
+
+More document about PikaScript: https://pikadoc.readthedocs.io/en/latest/index.html