This updates Twenty Thirteen, Twenty Fourteen, Twenty Fifteen, and Twenty Sixteen as follows:
* Remove legacy Internet Explorer support by deleting EOT file rules from CSS.
* Remove IE hacks from the version included in Twenty Thirteen and Twenty Fourteen.
* Remove `filter` rules from the CSS included in Twenty Sixteen.
* Remove the TTF and SVG `src` references for all four themes.
* Remove all prefixes from transform in the rotate and flip classes available in Twenty Sixteen.
* Edit the values for prefixed transition properties in Twenty Fifteen and Twenty Sixteen.
* Update CSS comments.
Developed in https://github.com/WordPress/wordpress-develop/pull/10427
Props sabernhardt, metodiew, peterwilsoncc, mukesh27, westonruter.
See #56699, #58836.
Fixes#62128.
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