Added new subfile dialog

Fixed additive selection; use a green selection area background instead of blue when selecting additive; selection area borders now appear black on bright backgrounds; single additive picking an already-selected object un-selects it.

Converted combo boxes in add object and new part dialogs to radio buttons. Added a convenience widget which makes it easier for me to add groups of radio buttons. My first widget.. :')

Cleanup and some restructuring

(0) -100 -30 -10 -4 +4 +10 +30 +100 +300 +1000 tip

mercurial