some more gtk spin-button cleanup ( Preferences / Surface Inspector / Patch Inspector / Arbitrary Rotation / gtkGenSurf plugin )
Added 'Always use Caulk for new brushes' to preferences
Added a toggle button to the main toolbar for creating Structural/Detail brushes
Merge pull request #211 from QBall147/master

Get rid of the rest of those gtk deprecated warnings for gtk-spin-button, also added 'Always caulk a new brush' to preferences