rewrote protocol version system (including splitting PROTOCOL_QUAKE into PROTOCOL_QUA...

rewrote protocol version system (including splitting PROTOCOL_QUAKE into PROTOCOL_QUAKE, PROTOCOL_QUAKEDP, and PROTOCOL_NEHAHRAMOVIE)
made server able to host PROTOCOL_NEHAHRAMOVIE protocol for completeness
added PROTOCOL_DARKPLACES7 protocol (still in development, not enabled by default) which allows players to use QW-style movement messages (makes prediction rock solid but has speedcheat/lagaport potential)

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@5326 d7cf8633-e32d-0410-b094-e92efae38249