Lataa Pocket Sync 5.5.0

What's Changed
- Fixes occasional issue where items in the "Fetch" page would fail to correctly scan the files & show "Loading..." forever. Also a speed bump to the file scanning.
- Fixes a few things that've been annoying for a while by @neil-morrison44 in #358
- The "next" and "previous" buttons in the screenshot view now actually do different things instead of both being previous
- Image Packs are now sorted by most-populated & when looking at images for a single platform ones without that platform aren't shown
- The "fetch" part will no longer incorrectly show progress bars on all items instead of just the one that's being fetched
- If a core has multiple cores within a zip there's now UI for enabling each core individually. Note: this doesn't fix it silently downloading all the bundled cores when updating one.
- Show MSX in the games list (or any core that has entries in data.json that aren't required but start with "Slot")
- Bulgarian language added by @toto99303 in #357
- Adds a way to view the changelog by @neil-morrison44 in #359
- "What's new?" button on the about screen
New Contributors
- @toto99303 made their first contribution in #357
Full Changelog: https://github.com/neil-morrison44/pocket-sync/compare/v5.4.0...v5.5.0