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

.gitmodules

@@ -10,3 +10,6 @@
 [submodule "Libraries/SDL"]
 	path = Libraries/SDL
 	url = https://github.com/libsdl-org/SDL.git
+[submodule "Libraries/minitar/minitar"]
+	path = Libraries/minitar/minitar
+	url = git@github.com:gabscoarnec/minitar.git