Even more improvements including but not limited to: - detect protobuf well-known types - detect NonUserCodeAttribute - detect ObsoleteAttribute to mark protobufs/fields as deprecated - parse generated client/server types for gRPC services - fix "optional" parsing - fix obfuscated name translation - fix foreign nested protobufs - support protobuf editions and corresponding options - rewrite protobuf models to better reflect the specification, including decoupling toplevels and files - rewrite a bunch of things to make more sense