Instrumentation of ui events.

Cleanup.
Fixed firstplay on IOS 6.1.2.

Other platforms may be broken now.
Fixed nasty bug in play command.

Improved logging.
Hide play button if still playing after a play command has finished.
Made focusing on play/pause buttons work agani.

Fixed keyboard shortcuts for play/pause.

Player render code cleanup.
Added playback rate support to play command.

Added auxillary command: wait.
General cleanup of player class.

Fixed playback support.

Changed the way playback rate is set by handing over playback rate to play command.