- experimental, very rudimentary method added to create shapes via context menu:
 * right click anywhere in the 3d view , select the type of shape you want (not configurable for now)
 and they get added to code and view : basic but works
 * added "injectContent" method to project class to be able to inject code from various places
 * did a few changes to the code editor to avoid infinite, recursive event dispatching
 * added newer version of bootstrap context menu