Maintenance 10/15/13 pt. 2

Here we go again.
+Added framework for editing the figure at the current keyframe
(clicking Figure Properties button with a custom stick frame selected).
Non functional for now.
+Delete joint button in stick editor works; and doesn't break the draw
order.
+Re-organized some code around the StickEditor.
+Fixed a non-fatal mishap in saving custom figures, which caused them to
render twice on top of eachother in the canvas. (new StickCustom(false);
when it should be new StickCustom(1);