Restore entity state baseline support

It was disabled when moving entity state netfields to game/cgame.
Read multiple clc_voip on server

This should allow multiple local players to use voip at the same time in the future.
Make legacy protocol the same as current protocol

Vanilla Q3 network compatibliy is not supported, so remove code specifically for it.
More reliable clientNum of new local player

Send local clientNums in each snapshot, to know real clientNum of new player for sure.
Print clientNum in MSG_ReadDeltaPlayerstate's cl_shownet message.
Remove SNAPFLAG_MULTIPLE_PSS (it only existed for vanilla q3 network compatiblity).