Add relavent OSX midi options in the startup dialog
- MIDI driver options are now "None" and "coremidi" on OSX
- If coremidi is selected, jack will start with midi activated
- Requires Jack OSX version 0.90 beta 15 (or another version that
  supports midi
Send a song position pointer with mmc and fullframe fake locating
Add method to send a song position pointer message
Moving Mclk locating code to ticker.cc. Housekeeping
Housekeeping, code style