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

Tactility/Source/service/espnow/EspNowService.cpp

@@ -20,11 +20,13 @@ static uint8_t BROADCAST_MAC[ESP_NOW_ETH_ALEN];
 
 constexpr bool isBroadcastAddress(uint8_t address[ESP_NOW_ETH_ALEN]) { return memcmp(address, BROADCAST_MAC, ESP_NOW_ETH_ALEN) == 0; }
 
-void EspNowService::onStart(ServiceContext& service) {
+bool EspNowService::onStart(ServiceContext& service) {
     auto lock = mutex.asScopedLock();
     lock.lock();
 
     memset(BROADCAST_MAC, 0xFF, sizeof(BROADCAST_MAC));
+
+    return true;
 }
 
 void EspNowService::onStop(ServiceContext& service) {