[#3028] Loading feedback for sequence still loading.
[#3028] Only show loading feedback when sequence is on, and do not cover controls.
[t3041] First pass at media editor for sequencer + gallery
[t3014] Added media stuff
[t3041] Slight spacing issue and FF overflow issue fixed
[t3041] Added test check into mediatypes.js
[t3041] Update source directly after updating start and end so that the source works
[t3041] Use popcornOptions to update
[t3041] New sequencer update in media editor
[t3041] New icon
[t3041] Overflow style fix
[t3041] Base media box
[t3041] Base media functionality