adding USIKS (MKS/OKS) mod

should tick the checkmark of MKS/OKS in https://github.com/KSP-CKAN/CKAN-meta/issues/23

I'm unsure how many of the dependencies are required, but I chose to mark every module that is bundled with the MKS/OKS release zip-file as a dependency.
This should be FirespitterCore to avoid installing also all the parts of FS, FirespitterCore is just the dll.