Solarium: fix a few issues with crates collisions
Fixes !180 (comment 1426020774) and #211
Some crates were non-solid and covered with common/clip
brushes, allowing weapon projectiles to pass through them.
Other crate models were solid and caused a Collision_ValidateBrush
warning when loading the map (this could be due to a bug in q3map2 though).
Make all crates non-solid and cover them with common/weapclip
brushes for consistency.
Since the 3 crates on the grass outside have a slightly different position than before, and since the collisions have changed regardless, this MR targets the pending-release
branch.