Introduces glasspane to capture events continuously.
Canvas-group displays underneath, doesn't interact with user directly.
Fixes cursor-reset
Transmit event-coordinates relative to canvas's coordinate system
Restores colored backgrounds
Uses Glasspane-Coordinates for events, transforms to Canvas-Coordinates only when necessary.
Cleanup
Cleanup
Cleanup
Restores tooltips to Charm trees
Adds special views. They just don't work yet.
Cleanup