first retimer commit

started retimer ui
fixed main index.html UI

somehow the index.html file broke so I copied the master file into the
retimer branch so that the main UI works.
Updated Retimer UI/draws arrows

Basic UI created, button icons input.

Arrow canvas updated. You can draw and drag "arrows" they currently, can
be dragged past each other, but that will be fixed in next commit.
playground for text_entry, plus some beginnings of a model and controller
Merge branch 'master' of github.com-jonathanwangmit:aehsu/pentimento into jonathan
Fixed sizing of audio frames
Created tracks container
playhead dragging
playhead animation starts
playback of all tracks
fixed border on segments
fixed segment and track css
fixed segment height to fit to track
Moved audio to separate folder
removed temp files
Separation into different controllers
refactoring. broken