Use https for apps.wordpress.org links.

props pento.
fixes #29595 for trunk.
Built from https://develop.svn.wordpress.org/trunk@29721


git-svn-id: http://core.svn.wordpress.org/trunk@29495 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add 'Unattached' filter for galleries.

props pento.
fixes #29329.
Built from https://develop.svn.wordpress.org/trunk@29722


git-svn-id: http://core.svn.wordpress.org/trunk@29496 1a063a9b-81f0-0310-95a4-ce76da25c4cd