Merge develop into main (#327)

## New features
- Implemented support for app packaging in firmware and `tactility.py`: load `.app` files instead of `.elf` files. Install apps remotely or via `FileBrowser`.
- Ensure headless mode works: all services that require LVGL can deal with the absence of a display
- Service `onStart()` is now allowed to fail (return `bool` result)
- Added and improved various file-related helper functions

## Improvements
- Completely revamped the SystemInfo app UI
- Improved Calculator UI of internal and external variant
- Fix Chat UI and removed the emoji buttons for now
- Fix for toolbar bottom padding issue in all apps

## Fixes
- Fix for allowing recursive locking for certain SPI SD cards
& more

ExternalApps/GraphicsDemo/manifest.properties

@@ -0,0 +1,13 @@
+[manifest]
+version=0.1
+[target]
+sdk=0.5.0
+platforms=esp32,esp32s3
+[app]
+id=com.bytewelder.graphicsdemo
+version=0.1.0
+name=Graphics Demo
+description=A graphics and touch driver demonstration
+[author]
+name=ByteWelder
+website=https://bytewelder.com