Consider using a Clojure protobuf library

[oubiwann]

A not insignificant portion of mesomatic is concerned with converting Clojure to and from protobuf data.

Questions to be answered:

• [ ] How significantly smaller would the mesomatic codebase be if we used a library like protobuf?
• [ ] Would it be possible to preserve 100% of the current mesomatic API and usage?
• [ ] What differences are there between mesomatic serialization and how the protobuf project does it?
• [ ] Same question for deserialization ...
• [ ] Would a move to a protobuf library be facilitated by anyt refactoring tasks in mesomatic?