Merge pull request #1260 from ferongr/v3

Autohide persistent QR in catalog, fix #1241
Don't nuke DataBoards when threads.json 404s, as 4chan fucks up often.
Fix #1262.
Tiny linkifier fix.
Start desktop notification closing timeout only after they appeared.
Drop support for prefixed flexbox.
Make use of xhr.timeout.
Fix image contraction not always moving us back to the post.
Fix the QR showing incorrect file data when opening multiple files at once.
Remove a Chrome bug notice as it didn't seem to actually work.
Uncomment that for xtra stability.
Deconstruction of a URL-matching regular expression.
Only allow specific protocols to avoid matching random stuff like fma:brotherhood.
Take <br>s into account when walking down the nodes.
Tiny refactor in ThreadUpdater.
Release 4chan X v3.11.0.
Grunt task options can work on a global level.
Update archives.json

SSL on 4plebs
Merge pull request #1268 from pleebe/patch-1

Update archives.json
Fix the padding of QR inputs on Windows.