Parse protobuf messages in web emulator (#1573)
Parse protobuf messages in web emulator (#1573)

This uses the https://github.com/protobufjs/protobuf.js library and
loads the proto descriptors from GitHub.

Ref #1067
project-oak/oak,project-oak/oak,project-oak/oak,project-oak/oak,project-oak/oak,project-oak/oak,project-oak/oak