Extension repo improvements

[null2264]

• [x] Display Name (covered by repo.json from Mihon, fallback to Unnamed) (https://github.com/mihonapp/mihon/pull/506)
  • [x] Trust the signature from repo.json (https://github.com/mihonapp/mihon/pull/570)
• [ ] Browse -> Extensions filtered by repo
• [x] Use marquee effect on overflowing text
• [x] Use DB
• [x] Redesign to use dialog to add repo (I'll just keep it as it is, maybe use dialog for edit instead)
• [ ] Redesign ExtensionRepoItem, criteria:
  • [ ] Edit button (to edit name and url)
  • [x] Show display name
  • [ ] Feedback when reloading extension repo, toast maybe?
• [ ] Backup/Restore (supersedes GH-229)

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Known issues:

• Repo list didn't update when a repo is added (Fixed on https://github.com/null2264/yokai/commit/c10ffe8ac5a627f7016fefb9cd7f77020e0792c3)

[null2264]

The trust sources by repo - how does it work? Is there a way I can trigger that, or does it happen automatically when I trust a source in the extensions tab?

As soon as you added a repo it'll auto trust every extension from that is included in that repo. Assuming the repo has repo.json.

[null2264]

Is there a way I can trigger that

It'll happened automatically but if you need to manually triggered it for some reason in the extension repo settings (Settings > Browse > Extension Repos) you'll find a reload button on top right corner, you can use that to manually fetch latest repo(s) data.