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/ServiceRegistration.cpp

@@ -77,8 +77,15 @@ bool startService(const std::string& id) {
     instance_mutex.unlock();
 
     service_instance->setState(State::Starting);
-    service_instance->getService()->onStart(*service_instance);
-    service_instance->setState(State::Started);
+    if (service_instance->getService()->onStart(*service_instance)) {
+        service_instance->setState(State::Started);
+    } else {
+        TT_LOG_E(TAG, "Starting %s failed", id.c_str());
+        service_instance->setState(State::Stopped);
+        instance_mutex.lock();
+        service_instance_map.erase(manifest->id);
+        instance_mutex.unlock();
+    }
 
     TT_LOG_I(TAG, "Started %s", id.c_str());