* Style status loading as a regular update message like on the other screens
* Move compare two checkbox to diff header to avoid an overlap on long post titles
* Restore color shades for the scope of changes visualisation
* Show tooltips while moving the slider handle
* Diff header styling
* Move color declarations to classic/fresh stylesheets
* Sync admin color stylesheets
props jrbeilke for initial patch. see #23935.
git-svn-id: https://develop.svn.wordpress.org/trunk@24119 602fd350-edb4-49c9-b593-d223f7449a82
