New icons: `.dashicons-external`, `.dashicons-editor-contract` and `.dashicons-universal-access-alt`.
Updated icons: `.dashicons-code`, `.dashicons-universal-access`, `.dashicons-arrow-x-alt` and `.dashicons-arrow-x-alt2`.
Restores also `.dashicons-post-trash` as an alias for `.dashicons-trash`, which is the new one.
props melchoyce, empireoflight.
see #26936.
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If you want to use a Dashicon before an element you can use the class because it will not change the elements content styling. With that you don't need to copy the entire `.dashicons` styling to your :before styling anymore.
To demonstrate this change, Admin Menu now uses Dashicons classes directly.
And it fixes a glitch in IE.
fixes#26630.
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Still to come: more color schemes, a responsive component, and more.
see #25858.
props iammattthomas, tillkruess, EmpireOfLight, melchoyce, ryelle, joen, mitchoyoshitaka, sirbrillig, andypeatling, isaackeyet, Otto42, dd32, matt, helen.
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