Changes 🌈
* Remove deprecated "alpha" PrintNanny API
* Implement high-quality WebRTC stream
* Require PrintNanny OS (OctoPrint edition), display compatibility in OctoPrint wizard
* Support local/private LAN streaming via Janus Gateway deployment, AKA "edge" mode
* Send PrintNanny Cloud API requests via forward proxy as a security measure (disallow cross-origin requests from OctoPrint javascript)