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/install-prerequisites.sh

@@ -1,4 +1,4 @@
-#!/usr/bin/sh
+#!/bin/sh
 
 # Install Linux package prerequisites needed for LVGL development
 # and testing. Some less-common development packages are not included
@@ -6,4 +6,5 @@
 #
 # Note: This script is run by the CI workflows.
 sudo apt update
-sudo apt install gcc python3 libpng-dev ruby-full gcovr cmake
+sudo apt install gcc python3 libpng-dev ruby-full gcovr cmake libjpeg-turbo8-dev libfreetype6-dev pngquant
+pip3 install pypng lz4