Move media modal colors out of `colors.css` and into `media-views.css`, as the modal can be triggered on the front end. props avryl, props collinsinternet for the initial patch. see #26677 for trunk.

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TinyMCE: update compat3x.min.js and bump $tinymce_version. See #24067, fixes #26750.
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Update the wp-inclues/vars.php file header to include Nginx as a recognized web server.

Props netweb for the initial patch. Props markjaquith.
Fixes #26249.

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