Fixed some starburst issues with matching and layout.
Fix a bug where the timing speed could go to zero because the decrease button was always enabled when playing. Fix another bug where the Increase / Decrease buttons where not initially enabled until the sequence was played once.
Make a fix to try and prevent rendering on null Display item. Reported by a test user on a recent dev build.
Merge remote-tracking branch 'remotes/derekbackus/master'
Merge remote-tracking branch 'remotes/jeffu231/EditorTimingSpeedBug'