v2.9.0 - skips `_alternatives` & some fixes for things that get polled

What's Changed

• Show when the newsfeed was last refreshed by @neil-morrison44 in #90
• Improved inventory updating by @neil-morrison44 in #91
• Add option to skip files under _alternatives folder by @neil-morrison44 in #92
• Switch to using an Arc instead of the _b _c things. Not much nicer really but more rusty. by @neil-morrison44 in #93

(I'm working on adding back MiSTer save syncing, but it's going to take a while)

Full Changelog: v2.8.1...v2.9.0

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Quick links:

• Mac: Pocket.Sync_universal.app.tar.gz
• Linux (also available via Flatpak): pocket-sync_2.9.0_amd64.AppImage
• Windows: Pocket.Sync_2.9.0_x64_en-US.msi