ctf_urbanbrook_b7a

ctf_urbanbrook_b7a RC1a

An update for the map to fix several longstanding visual bugs.

Several visual bugs have been fixed including
- Some visible nodraws
- Prop alignment issues
- Obvious prop fades
- The fog not getting set when taking a certain route from blue spawn
I've also toned down the bloom a tad, built a new ceiling for blue lobby, cleared out the remaining props from the construction pack, and made some other minor changes.