Avoid notices when default and light are not registered color schemes. see #26468.

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Don't set the theme overlay active state in the Theme view, as it overwrites the same work in the Details view.

fixes #26481.

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RTL font-family overrides. (Tahoma generally, and Arial for Hebrew.)

props yoavf.
fixes #24977.

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Expand adminmenu from 150px to 160px, creating more room for pending comment counts and translated text. Fixes #25918, props ocean90.


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Updates screen Help page should explain the auto-update feature. Fixes #25688, props jenmylo, trepmal.


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Make older mobile browsers and IE7 usable:
- Text labels in the toolbar.
- Image icons in the visual editor.
- Some IE7 structural css fixes.
Fixes #26369.
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Add widgets page draggable/sortable items to -ms-touch-action rules for proper touch scrolling in IE 10 and 11.
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Remove many of the now-unused images in core. Some images have been left for now, notably our previous style icons, action indicators, and images that see a higher frequency of use in plugins to allow them more time to adapt to the new design. props ocean90, Ipstenu, coffee2code. fixes #26036.

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Fix error in postbox.js attempting to change screen columns on mobile devices orientation changes, fixes #26493.
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Provide an SVG > PNG fallback for the WordPress logo on readme.html. See #26348.
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Specify transition: none on plugin information dialog tabs to keep them from jump jumping around. Fixes #26498.
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