Large code refactoring.
Minecraft server io is organized in Stream.
Added thread for console io; console commands now possible.
Cleaned up Launcher.
Static logger methods now in use.
All server io handled with GetString and PutString in static Stream methods.
Util.ServerRunning acts as global flag to threads; is false when main server thread has terminated.
stream mechanics taken out of WrapperThread, and put in Stream.