RCON upgrade with additional logging system improvements:
* Netconsole's can now log received messages in color, even when the RCON server has ANSI colors disabled; logs are fully composed locally.
* RCON server now also sends the log type over the wire, along with the (already existing) context.
* SDK logging code is now shared with the standalone netconsole application.
* Improved logging readability for the standalone netconsole application.
* Use game's CNetAdr RCON and socket creator.
* Add support for constructing host from [ip]:port format in the netconsole client.
* Pass 'netadr_t' parameter by reference to 'CSocketCreator::OnSocketAccepted'.
Implemented StringSplit() (split string with a delimiter, and stop splitting after either the last delimiter has been reached, or nMax, so when nMax is 2, then 'SET mat_sky_color 255 255 0 255' gets split into: "SET" "mat_sky_color" "255 255 0 255").
Netconsole now sends ConVar's/ConCommands and values separately with use of StringSplit.
ConVar now uses internal ChangeStringValue (this runs the callback).
