Admin color schemes: Manually handle RTL and minified versions of the CSS files on registration.

This bypasses WP_Styles entirely, which is much simpler for the moment, given that color schemes bypass WP_Styles for plenty already. The script loader is told to stop thinking of colors.css as an RTL-ified file. The colors-fresh handle, used directly on the login screen, needed to be (even before this commit).

fixes #26316.

Built from https://develop.svn.wordpress.org/trunk@26780


git-svn-id: http://core.svn.wordpress.org/trunk@26667 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Tell the script loader that colors-fresh should be treated as an RTL style, as explained (but omitted) in [26780]. see #26316.

Built from https://develop.svn.wordpress.org/trunk@26781


git-svn-id: http://core.svn.wordpress.org/trunk@26668 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Cron: Fix a case where a cache inconsistency can cause wp_clear_scheduled_hook() to enter an infinite loop. This unravels the function from using other cron api functions to looping over the cron array directly. See #25773

Built from https://develop.svn.wordpress.org/trunk@26782


git-svn-id: http://core.svn.wordpress.org/trunk@26669 1a063a9b-81f0-0310-95a4-ce76da25c4cd