EXP-1205 PROGRESS -- As a User, I want a toybox which will contain all buttons...

EXP-1205 PROGRESS -- As a User, I want a toybox which will contain all buttons that I can d&d into the toolbars
EXP-1210 FIX -- Implement new toybox floater window
EXP-1231 FIX -- Add menu option to toggle the toybox floater on and off

* Basic toybox floater implemented as its own class
* Toybox is available through "Me -> Toolbars..." menu option or ctrl-T shortcut
* Toolbars now have "side" type rather than simple orientation, as well as button
  state for "icons only" or "icons with text".

Reviewed by Richard