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

Documentation/releasing.md

@@ -25,4 +25,4 @@
 
 1. Mention on Discord
 2. Consider notifying vendors/stakeholders
-3. Remove dev versions in `sdk.json`from [TactilityTool](https://github.com/ByteWelder/TactilityTool) and upload it to [CDN](https://dash.cloudflare.com)
+3. Update SDK updates to CDN at [TactilityTool](https://github.com/ByteWelder/TactilityTool) and upload it to [CDN](https://dash.cloudflare.com)