Do not output default gallery styles if the theme has opted into HTML5 galleries.

fixes #27045. see #26697.

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Rename maybe_regenerate_attachment_metadata() to wp_maybe_generate_attachment_metadata(), to match wp_generate_attachment_metadata().

fixes #26825.

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Update the Customizer API inline docs.

props ericlewis.
fixes #27065.

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Use esc_attr_e() instead of _e() for attribute values.

props DJPaul.
fixes #27274.
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Restyles the modal for attaching media to posts, props avryl, see #26952
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