Andrea Fercia 4ac63be963 Accessibility: improve the color contrast ratio for the TinyMCE button icons.
Also, tries to use the new grays from the Design Handbook wherever applicable.

Props michaelarestad, afercia.
Fixes #35604.
Built from https://develop.svn.wordpress.org/trunk@36528


git-svn-id: http://core.svn.wordpress.org/trunk@36495 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-02-15 21:11:28 +00:00
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