koth_mineshaft b5

It didn't feel like the geometry had changed enough to call it v3.

- New walls on point
- New health/ammo pickups, probably too many of them
- New roof on the bridge with detail added prematurely
- The tunnels under the bridge are now wider and shorter

Fixed the blue spawn in red's base

-Fixed the slow door
-Side doors are now bigger
-Rescaled the map
-New courtyard area
-New routes to bridge