Acapela TTS is not integrated with the Android TTS API

The new Monarch device now uses Acapela TTS instead of the Android TTS  engine that was previously used in the client app.

We need to:
- Understand how Acapela is exposed to the system (SDK, system TTS)
- Obtain sample code and relevant documentation for Acapela TTS
- Verify support for callback functionalities 
- Complete migration to Acapela TTS (removing Android TTS )