Fixed the t-arms model being messed up in the .kv file.

RC3:
-Improved mobility around the map, including removal and widening of doors and generally widening pathways.
-Vents above B have been reworked to be less claustrophobic.
-Added more/brighter lighting to some of the darker pathways (still creepy).

-Added Interior too the B building, connects CT Spawn, Bombsite B and Tunnels
-Modified B-side Tunnels for more cover
-Added cover in mid/Tspawn to help terrorists cross to trains
-Customized .nav file with place names and improved bot behavior.

- Extensive visual update
- Added stairs from tunnels to CT spawn (for more direct rotations)
- Added vents from T sniper window to tunnels
- Modified vents layout near B (minor change)