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/changelog_gen.sh

@@ -1,3 +1,4 @@
+#!/bin/sh
 # Generate CHANGELOG_LAST.md from changes since the last version tag. (vx.y.z-dev tags are ignored)
 # CHANGELOG_LAST.md can be edited manually if required and manually added to docs/CHANGELOG.md
 #
@@ -7,9 +8,9 @@
 # Usage:
 #    changelog-gen <next-version>
 #
-# Example: if the latest verision is v5.6.7 the followings can be used for bugfix, minor or major versions:
+# Example: if the latest version is v5.6.7 the following can be used for bugfix, minor or major versions:
 #    changelog-gen v5.6.8
 #    changelog-gen v5.7.0
 #    changelog-gen v6.0.0
 
-auto-changelog -t changelog-template.hbs -l false --latest-version $1 --unreleased-only  --tag-pattern ^v[0-9]+.[0-9]+.[0-9]+$ -o CHANGELOG_LAST.md
+auto-changelog -t changelog-template.hbs -l false --latest-version $1 --unreleased-only  --tag-pattern ^v[0-9]+.[0-9]+.[0-9]+$ -o CHANGELOG_LAST.rst