Support for Star Trek Elite Force 2 Demo BSPs

[wfowler1]

The free demo version of EF2 has a slightly different BSP format. The header is actually FAKK v19. As far as I can tell, only two things are different from the retail version of the game. Brush side and Brush structs are the same as Quake 3, rather than the retail EF2 format where realDbrushside_t swaps plane and shader and realDbrush_t swaps firstSide and numSides. This should be pretty easy to implement, and I feel is worthwhile for completeness' sake.

[zturtleman]

Thanks for the information.