progress check in
spacing!
TextTrackMode implementation
bit more fleshing of of AddCue/RemoveCue on TextTrack/TextTrackCueList
set mType as empty string for now
adding line attribute to TextTrackCue
working on constructor for TextTrack, fleshing out methods
return nullptr for cueList/activeCueList if mode is Disabled
clean up after ourselves by deleting both cue lists
adding cues to the CueList
GetCueById & IndexedGetter for TextTrackCueList