This adds play/pause controls to video headers, along with voice assistance, using `wp.a11y.speak`, to make custom video headers more accessible. To make styling the play/pause button easier for themes, CSS has been omitted from the default implementation. This also includes a refactor of the `wp.customHeader` code to introduce a `BaseHandler` class, which can be extended by plugins and themes to modify or enhance the default video handlers. Props davidakennedy, afercia, bradyvercher, joemcgill, adamsilverstein, rianrietveld. Fixes #38678. git-svn-id: https://develop.svn.wordpress.org/trunk@39272 602fd350-edb4-49c9-b593-d223f7449a82
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