Invisible glass is the best glass, who agrees with me? This also adds circular saw slabs for invisible glass, because a 1/16 glass ceiling or floor gives more vertical space than a full block. The other shapes lack descriptive names making it impossible to tell them apart.
I also found a bug in the colored shieldblocks, there is no space between color and name, oops! I also refactored to remove duplicate code and unneeded aliases.