Now you can easily parse EXL files, and this commit includes changes
to GameData to easily extract a EXH from just an excel sheet name
like "Item" or "Map". However this still doesn't work for language
seperated excel sheets yet.
Will now compile out of the box on Windows MSVC.
Right now, out of the box game installation is not supported
as per unshield being non-functional on Windows, will be porting
to Windows or finding a workaround in the near future.
