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. Built from https://develop.svn.wordpress.org/trunk@61109 git-svn-id: http://core.svn.wordpress.org/trunk@60445 1a063a9b-81f0-0310-95a4-ce76da25c4cd