added ping and status command output parsing in the client, currently this is used...

added ping and status command output parsing in the client, currently this is used to get pings in the scoreboard on Quake servers (and of course older DP servers), the server sends a pingplreport command after the human-readable ping report so that the packet loss display works (but only if the server supports this), changed client to send ping command instead of pings (at least until the next protocol version increase) and the client will not print ping report messages while the scoreboard is displayed.  the status command parsing is not actually used at this time but could be the basis of iplog support

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@6507 d7cf8633-e32d-0410-b094-e92efae38249