Add OS X maintainance to the list of open tasks
Rename the "cdvolume" functions to "cdenable"

Historicaly this functions were used to adjust the cd music volume. In
YQ2 they were converted to enable or disable the cd music. Change their
name to match their current purpose.
Rename the 'ogg volume' functions to 'ogg enable'

These functions never set the OGG volume, the just enables or disabled
OGG playback. Rename them to match their purpose.