AutomationEditor: improve zoom functionality
- entire wheelevent code was written very... weirdly, I simplified it
- fix bug with x zoom with mousewheel, no more getting stuck between 25/50
- ctrl+shift+mousewheel now zooms y-axis
- ctrl+alt+mousewheel now changes quantization
AutomationEditor: CSS stylability
AutomationEditor - fix previous
Merge pull request #792 from diizy/autoeditor

AutomationEditor: improve zoom, CSS