Adds Gang Garrison Object Notation scripts, made by AJF (https://gist.github.com/TazeTSchnitzel/085463d0bfd0d81463e7#file-ggon-md)
Currently used for a new entity saving format.
Various changes to gang garrison builder 2
Adds cspotcode's GG2DLL because ajf told me to now that the garrison builder repository is pretty much obsolete.