server.h:
add rcon_from_user
sv_ccmds.c:
add SV_ConSay_Info_f (sayinfo) for quiet info messages and revamp the
rest of SV_ConSay_f accordingly. Also include deactivated commands for
cuff, mute, tell and ban (coming soon).
sv_main.c:
revamp the rcon system to support both `root' rcon and admin rcon and
provide better logging. admin_password is the cvar holding the password
for admin access (used the same way as rcon_password)
quakeio.h -> vfile.h
More diff reduction between trunk and my VFS code. Also took the time to
put some headers in order and fix a few #include's pointed out by moving
things around a bit.