v0.20.0

Scanning improvements. Previously-merged models will no longer be recreated on scan, and preview file choice is no longer overwritten. And, the scanner now automatically guesses at whether a part is supported or not.

What's Changed

• Automatically guess whether a part is supported during scan by @Floppy in #561
• Preserve tags and preview settings when rescanning by @Floppy in #562
• Don't duplicate previously-merged models during rescan by @Floppy in #564
• Fix delayed job in production by @Floppy in #563

Full Changelog: v0.19.0...v0.20.0