Adding explanatory text/reference positions to samples.
Playing with sample names/ordering.

Going to try an autoplay thing from main app.
Queue Cues for adding to Timeline.

Is there a better way to make this safe?
Should Choreograph bother to make it safe?
Is there a strong case for adding things to the
timeline from within timeline callbacks?
Correct Cue firing when moving backward.
Playing with auto-playing the samples.
Conditionally queue motions for inclusion in timeline.

If we're stepping through the list of motions, store in a queue.
Add from queue at the end of update.
Control structure for Cues.

A type that you can cancel to stop the cue from firing.
Caveats and alternatives around remove( void* ).
Use Cue control to cancel duplicate callbacks.
Play samples for 15 seconds before moving on.

Just for fun; will probably not auto-cycle (or do it in a more
nuanced way) in the future.
Merge pull request #5 from sansumbrella/safety

Timeline callback modification safety.