f45bfd913d
Refactor snap to work with core18. Giving the snapcraft.yaml a base property helps tremendously with the efficiency of the build process, and I believe that it puts us in a better position to reliably support non Ubuntu distros going forward. This also bases us on long supported bionic libraries, and gives us a nice place to work from as we add Python 3 and Stein support, as well as general polish and fixes.