I quickly realized that the "Dev" server is under the "Unknown" data center, and
that's kinda hard to select in the client. I'll think about a solution later.
Now the world isn't hardcoded to Gilgamesh, and is configurable. It's also now
the "Dev" server listed in the excel sheet which makes a more sensible default.
It's a hack and only really works going from New -> Old Gridania, but this does
work! It also means Kawari now actually requires a valid game installation,
since it has to read layer group information.
