Emergency release

⚠️ JLCPCB removed the download link to their parts database which broke the plugin. It now operates in an emergency mode where you can generate the producton files but cannot search for parts. Hopefully we can figure out a way to get this up and running in the future again.

What's Changed

• [emergency fix] attempt to allow startup even if we can't download the database by @binary1230 in #242
• [cosmetic] UX: improve error msg if JLC URL fails to download by @binary1230 in #243
• Look for jlc as well as lcsc properties for the LCSC number by @Bouni in #240

Full Changelog: 2022.11.01...2022.11.02