Collection of tests and tools to help diagnose WebRTC systems

Submitted this after seeing the story about Hublin: https://news.ycombinator.com/item?id=11293014

...I find that the tools we have are nearly good enough, but every so often the quality takes a nosedive in hangouts/screenhero/skype/adobe connect/gotomeeting/...and they offer no tools to diagnose the problem. It seems from the announcement of testrtc (https://webrtchacks.com/webrtc-troubleshooter/) that it was intended that the tests can be incorporated into 3rd party apps - here's hoping.