Refactor link handling to use a link macro

Instead of the special case handling for <a> tags

js/macros/link.js

@@ -0,0 +1,35 @@
+/*\
+title: js/macros/link.js
+
+\*/
+(function(){
+
+/*jslint node: true */
+"use strict";
+
+var utils = require("../Utils.js");
+
+exports.macro = {
+	name: "link",
+	wrapperTag: "span",
+	types: ["text/html","text/plain"],
+	params: {
+		target: {byName: "default", type: "tiddler", optional: false},
+		text: {byName: true, type: "text", optional: true}
+	},
+	handler: function(type,tiddler,store,params) {
+		var text = params.text || params.target;
+		if(type === "text/html") {
+			return utils.stitchElement("a",{
+				href: params.target
+			},{
+				content: utils.htmlEncode(text),
+				classNames: store.adjustClassesForLink([],params.target)
+			});
+		} else if (type === "text/plain") {
+			return text;	
+		}
+	}
+};
+
+})();