A2DP and Mozzi

• Stream Support for A2DP
• Integration of Mozzi Sound Generator

Stream Support

All Stream scenarios are working now:

• I2SStream
• AnalogAudioStream
• MemoryStream
• UrlStream
• A2DPStream
• GeneratedSoundStream
• AudioOutputWithCallback
• CsvStream
• and any other Arduino objects that support the Stream interface: Serial, File...

First Prerelease

The basic functionality is working.
Commit as basline for further changes