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.
I believe the distributed zipfile includes the full Firespitter, but if you heard it from RoverDude that Core is fine, I'm happy to fix it.