XI (doc): ServerController short hand

XI (doc): ServerController short hand

I will let the comment speak for itself.

  gServerController: TIWServerControllerBase = nil;
  // gServerController was too much to type all the time, but we keep the old one
  // so we don’t break code. But now you can access it as gSC as well.
  // gSC = gServerController
  gSC: TIWServerControllerBase = nil;