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).
* Pointer to g_pMemAllocSingleton
* New wrapper for returning the singleton, and creating one if not yet initialized (game shares the same pointer, and is aware of its creation).