added square light volume, and automatic light radius.
Merge branch 'master' of https://github.com/warmist/dfhack

Conflicts:
	plugins/rendermax/renderer_light.cpp
Made the lighting engine multithreaded.
Merge branch 'master' of https://github.com/warmist/dfhack
removed something I had for testing.
Added building size. Removed material flags (on by default)