Refactor test basicsay to playfile test
Add audio stream interface class
Move implementation to .cpp file
Let OggStream implement AudioStream interface
Use audio stream in Narrator
Initial implementation of Mp3Stream
Determine file type by file extension and create appropriate stream
Add more log messages for debugging
Add new sample files for playfile test
Set log level to debug
Convert decoded data to scaled float buffer
Transform extension to lower case for simpler comparison
Refactor dbtest, specify identifier and file to add
Add column encoding database table messageaudio

This table specifies how the audio data is encoded.
Set/get encoding when inserting/retrieving data from database
Set encoding to ogg when inserting Ogg Vorbis audio
Determine encoding and create appropriate stream
Add mp3 files of testdata
Support adding of mp3 audio to database
Testing adding and playing mp3 files