YouTube webfeed discovery

With UI fixes for personalized suggestions/topsites, and other minor fixes.

Personalized recommendations

Echoes back unvisited links as personalized recommendations.

Periodically tidies up the database for performance.

Cross distro & commandline flags/Desktop Actions fixes

Make libappstream and GCR3 optional.

Though I'd heavily discourage dropping the latter, and I quite value the former.

Reader Mode

Cross-distro fixes (leading to minor improvements for elementary OS).
Prepare to support a global dark mode.

Error/usability fixes

Fixes a freeze upon opening the certificate info.
Stops nagging users to make it the default browser, only asks on first launch.
Adds link to documentation.

New screenshots

Less disruption in focusing of the addressbar.
Webfeed fixes.

Minor webfeed fixes (largely around relative URLs)

Minor webfeed fixes.

feed/link may refer to the feed's website, not necessarily it's canonical URL.
Needed to handle relative links.
logic for finding the title was a bit off.
(wasn't needed, but thought it was) double check if what Odysseus recieved is a webfeed.

Debian packaging fix

Had a syntax error

Webfeed discovery

• Webfeed discovery support!
• Full Dutch localization
• Fix topsites editing
• Lower threshold for sourcing topsites from browser history
• Minor performance improvements

French locale, MSE enabled

1.5.11

Release 1.5.11!