v1.5.0 release cnadidate

Recently spent some time making several needed updates to this. I am using it with Plex and it works great. Faster tune times and better AC4 support without long ffmpeg build. This resolves all open issues. This will remain a release candidate until I can test for another couple weeks.

• major docker build update uses Emby pre-built ffmpeg binaries with excellent AC4 support
• removed async argument no longer needed with Emby ffmpeg
• updated modules to latest versions
• added multiple workers to uvicorn for faster tune time and better handling of multiple tunes
• configuration is now done through docker environment variables
• added info API that also reports version
• documentation update

Initial release

HD Home Run proxy docker that forwards ATSC 3.0 channels from the target HD Home Run device and converts the AC4 audio to AC3. This builds a complete ffmpeg binary from scratch as part of the docker build process. See README for more details.