Expand Protobuf example

[JohnAZoidberg]

Here's a protobuf version with all of the config, like the Markdown, Scala, Dhall and CBOR examples.

Binary size is 196 bytes.

TODO

• [ ] Choose a good input format (JSON is possible but I haven't found out-of-the-box tools)
• [ ] Optimize e.g. bitfields
• [ ] Make sure the python script works with the new schema

[JohnAZoidberg]

One question: Is it possible for a parser that doesn't know the full CDDL to ignore parts of the binary format that it doesn't know about?

Answering Tim's question about my CBOR example in relation to Protobuf: The parser can ignore unknown fields, unlike CBOR you cannot tell anything about the structure of the unknown fields. In CBOR you could parse them and pretty print them to the user.

For example: you as a parser encounter a field named debug that you don't know exists. The writer of the config structure renamed the debugging field to debug and put exactly the same information there. With Protobuf you cannot read it, with CBOR you can. I realize this is a scenario we can try to avoid, so I'm not sure if it's a big drawback of protobuf.