Updates `wp_register_font_collection()` and `WP_Font_Collection` so that only font families can be loaded from a file or URL.
All metadata, such as name, description, and list of font categories, needs to be passed directly in PHP so that it can be properly localized.
Props swissspidy, mmaattiiaass, grantmkin, youknowriad.
Fixes#60509.
Built from https://develop.svn.wordpress.org/trunk@57686
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This commits add three endpoints to retrieve and manipulate fonts in WordPress.
This commit also means that we now have a fully functional Font Library in the site editor.
Props get_dave, youknowriad, mmaattiiaass, grantmkin, swissspidy, mcsf, jorbin, ocean90.
See #59166.
Built from https://develop.svn.wordpress.org/trunk@57548
git-svn-id: http://core.svn.wordpress.org/trunk@57049 1a063a9b-81f0-0310-95a4-ce76da25c4cd