Added Nether Materials

Adds NetherMats for Hell biome
Material Set can specify Window material

Material Set can now specify a material and datavalue for windows, may
still get swapped out randomly for iron bars, and enabled material
specific doorframes
Smarter Pillars

If a nice spacing for pillars which allows one pillar at each end is
easily calculable, use this, otherwise fallback to 4
Window Fixes

More windows, higher percentage of them glazed, fixes empty window holes
Merge branch 'master' of https://github.com/Domos123/Gorm into Domos123-master
Fixed merge - Dom added getWindow() to MaterialManager, I'd changed the
material to GLASS. In addition, set the base of the window to the top to
make sure it's only 1 high.

Conflicts:
	Gorm/src/org/pale/gorm/roomutils/ExitDecorator.java