This adds the ability for themes to add support for videos in custom headers
by passing `'video' => true` as an argument when adding theme support for
custom headers.
Custom video headers are managed through the “Header Visuals” (i.e. “Header Image”)
panel in the Customizer where you can select a video from the media library or set a
URL to an external video (YouTube for now) for use in custom headers.
This introduces several new functions:
`has_header_video()` – Check whether a header video is set or not.
`get_header_video_url()` – Retrieve header video URL for custom header.
`the_header_video_url()` – Display header video URL.
`get_header_video_settings()` – Retrieve header video settings.
`has_custom_header()` – Check whether a custom header is set or not.
`get_custom_header_markup()` – Retrieve the markup for a custom header.
`the_custom_header_markup()` – Print the markup for a custom header.
And a new file, `wp-includes/js/wp-custom-header.js` that handles loading videos
in custom headers.
This also enables video headers in the Twenty Seventeen and Twenty Fourteen themes.
Props davidakennedy, celloexpressions, bradyvercher, laurelfulford, joemcgill.
Fixes#38172.
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The color control in the customizer can use the new mode by supplying the `mode` param with `hue` (as opposed to the new default `full` value). New control replaces the `range` control in Twenty Seventeen for `colorscheme_hue`. The `wpColorPicker` can opt for hue-only mode via supplying `hue` as the `type` option. Iris Color Picker is updated from v1.0.7 to v1.1.0-beta.
Props mattwiebe, celloexpressions.
Fixes#38263.
Built from https://develop.svn.wordpress.org/trunk@38931
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This was previously fixed in [38837], but it wasn't really the correct answer, to fix it in the theme. So, [38837] is reverted in this commit, and the Twenty Seventeen actions causing problems are unhooked before tests are run.
See #38372.
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