GitLab

added NAT traversal option and constructor test

Added example "chat" with README

fix CI and gx

For some reason, this was causing gx to freak out.

Mulit-protocol app with protobufs

(otherwise, the gx imports won't work)

We already have this one imported into GX. Saves the effort of importing a
different one.

(need to use the canonical repository location for everything to work)