Themes: Prepare theme.css for a merge with wp-admin.css.

* Let the code breathe.
* Add necessary vendor prefixes.
* Remove .current-label:before since it was hidden.

see #25966.
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Themes: Prepare wp-admin.css for a merge with theme.css.

* Remove styles for `#current-theme` and `.theme-options`. Markup removed in [26141].
* Move "Tabbed Admin Screen Interface" section out of "Themes" section. See [26466].

see #25966.
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Themes: Merge theme.css into wp-admin.css. fixes #25966.
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Inline documentation for hooks in wp-includes/formatting.php.

Props simonwheatley for the initial patch. Props DrewAPicture, kpdesign.
Fixes #25518.

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Correct @since values. see #25518.
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Escape smiley URL in translate_smiley().

props simonwheatley.
fixes #25529.
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Inline documentation for hooks in wp-includes/comment.php.

comment.php, a.k.a. "lots 'o hooks".

Props swissspidy for the initial patch. Props danieldudzic, kpdesign, and DrewAPicture.
Fixes #25522.

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Correct @since values. see #25522.
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Inline documentation for hooks in wp-admin/user-new.php & wp-admin/user-edit.php.

Also fixes one parameter type in wp-includes/user.php.

Fixes #25726.

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Rotate the Collapse arrows correctly for RTL, switch the Theme next/previous arrows in RTL. Fixes #26340

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Prefix the new Theme classes. Fixes #25966

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Themes: For small screen sizes, still allow access to the Customize button (Don't hide the theme actions). See #25948

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Add the proper padding-top for button's active states in small screens. Fixes #26346

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Themes: In the detailed view, disable the next/previous buttons when there are no more items. Fixes #26314

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Fetch only the required fields in confirm_delete_users().

props rodrigosprimo.
fixes #25178.
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Fix strict notices in Tests_POMO_PO.

props markoheijnen for initial patch.
fixes #25631.
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