WIP: Add support for pipelines from fossilize

This MR adds support to the run script from shaders from Hans-Kristian's "Fossilize" tool which has become something of a standard in the industry. The advantage of using fossils rather than the blob-based format of the current shader-db is that it's well-defined and, since it's JSON, you can parse it from python and manipulate it which isn't really something you can do with the current format. The fossilize tool also has nice tools for dumping the SPIR-V assembly.