Added GB and tools to GG2 repo from cspot's

Let's face it: the GB repo is completely abandoned; it hasn't been touched in three years. Garrison Builder should really be in the GG2 repo, as it is not really a separate project. Also, GG2DLL is in the Garrison Builder repo, yet GG2 relies on it and it has no usefulness outside of the GG2 project. So, I'm copying in Garrison Builder and GG2DLL into the GG2 repo.