Improvements to lighting and sunshadows

- Fixed use of nodraw textures on the edges of bathroom sink shelves in changing rooms
- Computers now come with mice

- Rotated map by 180 degrees on the Z axis to make sunshadows come from the front of the map
- Replaced static door brushes with rotating doors. All doors can now be opened with the use key
- Fixed locker rooms to make the opening the same width as the double doors.

- Sunshadows set to better angle, Light_environment set to values more suitable for this skybox. Should improve shadowing/lighting.

-Minor vis optimisation (added a couple of bits of geometry to func_detail that I previously overlooked)