change url scheme recognition for allowing abasurl to link

autolinking is not working for abasurl as it contains not url conform characters so you would still have to link it manually but it is not sanitized anymore.

packages/markdown/src/template-integration.js

@@ -37,7 +37,7 @@ function mySafeAttrValue(tag, name, value, cssFilter) {
   // then use your custom function
   if (tag === 'a' && name === 'href') {
     // only filter the value if starts with an registered url scheme
-    urlscheme = value.split(/:\/\//);
+    urlscheme = value.split(/:/);
     //console.log("validating "+urlscheme[0]);
     if(urlschemes.includes(urlscheme[0])) return value;
     else {