4.0 version bumps.

props kworthington.
fixes #27872, #27873.

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Remove version string from Thickbox so it assumes the WP core version. Bust some caches.

props celloexpressions.
see #27861, for trunk.

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Simplify the admin menu notification selector so color schemes don't get stomped. props celloexpressions. see #27920 for trunk.

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Use the proper translated string for Video Playlist "drag info" - the text displayed above the playlist's sortable attachments.

See #27937.


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Don't allow disabled input styling to get lost in the cascade. props ocean90. see #27906 for trunk.

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