Fixes bug where multiview won't update when reordering scenes with drag
and drop. Was originally fixed with #2114, but bcddf4d caused a
regression where it didn't work anymore.
Adds an option to the right click menu in the scenes widget to switch
modes. When in regular list mode, it'll let you select grid mode, and in
grid mode, it'll let you select list mode. Grid mode changes the scenes
widget to have a grid of buttons for scenes rather than a list, much
like XSplit.
VodBox
Clayton Groeneveld
jpark37