Merge develop into main (#167)

- WiFi Connect app is now hidden by default, but accessible at the bottom of the WiFi Manage app when WiFi is turned on.
- WiFi service now turns on WiFi when calling connect() and WiFi is not on.
- Removed `blocking` option for `service::loader::startApp()`. This feature was unused and complex.
- Various apps: Moved private headers into Private/ folder.
- Various apps: created start() function for easy starting.
- Added documentation to all TactilityC APIs
- Refactored various `enum` into `class enum`
- Refactor M5Stack `initBoot()` (but VBus is still 0V for some reason)

TactilityC/Source/tt_init.h

@@ -4,6 +4,10 @@
 extern "C" {
 #endif
 
+/**
+ * Initialization method for TactilityC
+ * @warning This is called from the main firmware. Don't call this from an external app!
+ */
 void tt_init_tactility_c();
 
 #ifdef __cplusplus