Beta Intel Room Floors + Beta Exit Sign

The floors in the intel rooms from the beta, based on various pre-release TF2 media such as screenshots and trailers.

For the RED team floor, we just restored it from the game's files, but for the BLU team floor, Blase005 had to recreate the texture based on early screenshots and Trailer 1.

Also included is the beta Spytech exit sign, based on the sign's texture from Trailer 2.