Track: make the song editor background CSS-stylable with qproperties
TCOView: Make patternviews foreground elements stylable with qproperties
For consistency, define text colour of bb-tracks in CSS too
Monstro updates: fixes, improvements, optimizations
Monstro: tweak the constants a bit
Merge pull request #567 from diizy/master

CSS styling features, Monstro updates