Wikirules now use better macrocall parser (#5451)

* wikirules now use better macrocall parser

Before, wikirules would use a deficient macrocall parser which couldn't
handle certain types of arguments. Now it uses the same one that the
widget parser uses. Less code!

* style changes and removing weird switch statement

That switch statement made more sense in an earlier iteration.

* comment improvements

* oops, wikirule macrocalls could do ONE thing better

* '=' wasn't allowed for widget macros, but why?

Now they're allowed for both widget macros and macrocall macros.

core/modules/parsers/parseutils.js

@@ -132,7 +132,7 @@ exports.parseMacroParameter = function(source,pos) {
 		start: pos
 	};
 	// Define our regexp
-	var reMacroParameter = /(?:([A-Za-z0-9\-_]+)\s*:)?(?:\s*(?:"""([\s\S]*?)"""|"([^"]*)"|'([^']*)'|\[\[([^\]]*)\]\]|([^\s>"'=]+)))/g;
+	var reMacroParameter = /(?:([A-Za-z0-9\-_]+)\s*:)?(?:\s*(?:"""([\s\S]*?)"""|"([^"]*)"|'([^']*)'|\[\[([^\]]*)\]\]|((?:(?:>(?!>))|[^\s>"'])+)))/g;
 	// Skip whitespace
 	pos = $tw.utils.skipWhiteSpace(source,pos);
 	// Look for the parameter