Block Primitives instead of Planes

[ellisgl]

Well it only works on objects that are selected before running the script, so it might be redundant. Not too shabby for my first real python script and my first blender api interaction. Of course I will need to learn about how python does OOP and then figure out how this register unregister thing works.

This map that I'm working on will probably be the first one I've completed ever (I've been playing around with mapping since Quake 1).