Easier than expected

Using the ScummVM tools as a base, it was really easy making an extracter for the .GJD files. Admittedly, it's not difficult, it essentially just a bunch of files stuck together, but I had expected to take a while to get going, so it's good to get an easy bit out of the way. Next (but not tonight), the vxd files, which although more tricky, really shouldn't prove too much of a problem.