Add support for marked.md smartypants 'smart' quotes

Author: Jacco-V

Diff for: src/core/render/utils.js

@@ -24,10 +24,10 @@ export function getAndRemoveConfig(str = '') {
   if (str) {
     str = str
       .replace(
-        /(?:^|\s):([\w-]+:?)=?([\w-%]+|"((?!").)*")?/g, // Note: because the provided `str` argument has been html-escaped, with backslashes stripped, we cannot support escaped characters in quoted strings :-(
-        (m, key, value) => {
+        /(?:^|\s):([\w-]+:?)=?([\w-%]+|"((?!").)*"|[“”][^“”]*[“”])?/g, // Note: because the provided `str` argument has been html-escaped, with backslashes stripped, we cannot support escaped characters in quoted strings :-(
+        function (m, key, value) {
           if (key.indexOf(':') === -1) {
-            config[key] = (value && value.replace(/"/g, '')) || true;
+            config[key] = (value && value.replace(/"|[“”]/g, '')) || true;
             return '';
           }