GUI cruft cleanup
slashed FrontEnd copypasta
SpectroControl uses S4mfccBuffer
spectrogram position update

Nice speedup when clicking on aligned words because the stream doesn't get computed again to update the spectrogram
spectro draw routine bound check
fix word timeline position not getting updated
cleaned up karaoke
cohesive TimeConverter
dead code removal (buffer package)
centralized frames per second
fix audio stutter when restarting playback quickly
gui.trackview -> gui.table

"trackview" is a confusing name since we have track-based and turn-based projects, but the package actually applies to both.
removed "refresh" button in SpectroControl
live visual feedback during alignment

fixes #26
interruptable alignment

fixes #27