Merge branch 'feature/ui-header' into release/1.0.1
Merge branch 'interface/theme' into release/1.0.1
Merge branch 'interface/nice-handles' into release/1.0.1
Update visualization style to more closely match Contours.
Increase smoothing amount on sketch lines to 0.75.
Rework theme colors a bit more, further matching Contours.

Now Polystrips and Contours theme system almost matches exactly, and wil be easy to extend a bit more when we have multi-selection support.