render window controls icons

eyeball dude: first person
flying eye: free cam
orbit2: orbiting cam
Merge remote-tracking branch 'crysthala/master'
added navigation mode icons to buttons
added scene toolbar toggle widget
added visibility flags
use name as a tooltip if no tooltip is given for scene tool bar toggle buttons
fixed visibility flags setting
added visual element selector toolbar button
explicitly flag scene as modified when changing visibility mask
fixed several bugs in the layout algorithm of the toggle scene tool
added control element selector toolbar button
Merge branch 'visibility'
removed the (partial broken) return/enter shortcut for custom push buttons, since there is already a space shortcut)
Added ForceJump/ForceMoveJump commands
cleanup
Merge remote-tracking branch 'scrawl/master'
Make sure player doesn't get any AI packages (Bug #1749)