Fix nonsolid grates and glass on several maps

Due to a breaking change in the way q3map2 determines brush solidity (netradiant#187 (closed)), some maps had nonsolid grates and/or glass after a recompilation (master is unaffected, fortunately).

This MR addresses this problem by replacing common/nodraw or common/nodrawnonsolid on the extra grates and glass faces with common/weapclip (thanks @divVerent for the tip, I was going to use common/caulk initially, which isn't always the best choice).

This MR also includes the lights changes introduced in !180 (closed) (I checked out bones_was_here/light then created this branch).