fixed audio waveform for 0071
Merge branch 'develop-0071' of github.com:Flightphase/ofxTimeline into develop-0071
Merge remote-tracking branch 'origin/develop-0071'
fixed video player load
refactor for ofxTimecode
Merge branch 'develop' of github.com:YCAMInterlab/ofxTimeline into develop

Conflicts:
	src/ofxTimeline.cpp
refactor to video player for background threaded thumbnails
rename Element to Track
background threaded thumbnail generation
video track // image track more refactors
refactor focus and keyframe multi-select. warning multi-select rect is broken.
Major refactor of key framers splitting them into separate classes
Modal content system put into place and implemented for ofxTLTweener
TLTrack refactors
ofxTLBangTrack -> ofxTLBangs; ofxTLTrigger -> ofxTLFlags and flag interaction model updated
removed and added comments
multi-select rectangle
auto save refactor. will make undo much easier
fixed active/focus distinction. working on re-implementing copy+paste
fixed loop type initialization bug
first stab at new switcher