Fixed and clarified various files

DELETED UDK/UDKGame/Config/Default*.ini: Unnecessary files - default UDK
configuration
NEW UDK/MDDCGame/Config/Default*.ini: Necessary files - MDDC-specific
configuration (with comments)
global.bat, local.bat: Comments added
udk-make.bat: Replaced *Engine.ini references with general %ini%
configured in local.bat