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-1233 PROGRESS -- Populate the toybox floater window with all FUI toolbar buttons
EXP-1235 FIX -- Make the toybox available through the context menus associated with the other toolbars
EXP-1248 FIX -- Implement context menu on toolbars

* New commands are listed
* Toolbars can now be made read-only (as in the toybox) or editable (as in the others)
* Toolbars that are not read-only have a context menu that allows button type editing.

Reviewed by Richard.