Move all Widgets to Canvas

[charlieroberts]

Android multitouch works inside of single DOM elements, therefore all widgets have to be drawn into a single Canvas. Hopefully, with optimization, this will be more efficient than the current drawing mechanisms anyways.

[charlieroberts]

Errrrr... hmmm. Even with my attempts to optimize and draw correctly canvas still seems -really- slow compared to DOM methods. I did implement canvas drawing for every single widget, maybe a better step would be to have this be an optional widget attribute like it is for the MultiButton widget.

I also realized that all my events are being handled by the parent container layer... this might suffice for Android multitouch to work if the events all bubble up.