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Add Shadow Clip Maps for negative light shadows.

Shadow Clip Maps are shadow maps that store the distance to the nearest
wall, and disable shadowing on all pixels that are further away than the
distance stored in the Clip Map, so that the negative light shadows don't
pass through walls.
Add gloss map support
Don't cull inner faces of armour. (Fixes see-through bug.)
Update configs & shaders for new models.

Also, split up the old reactor shader file, creating separate files for the
armoury and the repeater.
Merge branch 'master' into for-0.18