v1.7.0 Prerelease 3

This is another prerelease for testing. It includes the following additional changes:

• Update web client to 10.8.0 Alpha 5.
• Add --platform option. (#159)
• Added Xbox input mapping. (#197)
• Disable youtube-dl attempts on media errors.
• Allow retry with transcode instead of using a hard failure. (#127)
• Add exit app function (not used yet) (#198)

Please note as this is a prerelease the macOS build is not notarized.