PianoRoll: CSS stylability
Most parts of piano roll are now stylable:
- background color
- note color
- bar color (for volume bars)
- grid color
PianoRoll: wheelevent improvements, similar to AutomationEditor
- ctrl+alt+wheel changes q (as in auto)
- ctrl+shift+wheel changes note length
- changed note lock functionality slightly, it no longer changes itself to 1/16 because this would cause annoying infinite scrolling with the wheel, instead it just acts like 1/16 when notelength is last note
Merge pull request #789 from diizy/pianoroll

PianoRoll: CSS stylability, mousewheel improvements