Each tool can have its own set of properties that can be modified
through a panel on the right side.
The tools I've added properties for are:
Pen:
Thickness
Brush:
Size
Hardness
Spray:
Thickness
Density
Bucket:
Threshold
We use this to automatically update the thumbnail in LayerListWidget
when you draw into a layer. We also use it to repaint the ImageEditor
when the image changes somehow. :^)
