+ Concept of PluginModule and inherited classes such as ServerModule, MenuModule, ...

* Client now tracks current menu module. Auto detach events, etc.

core/menu_module.js

@@ -0,0 +1,29 @@
+/* jslint node: true */
+'use strict';
+
+var PluginModule			= require('./plugin_module.js').PluginModule;
+
+exports.MenuModule		= MenuModule;
+
+function MenuModule() {
+	PluginModule.call(this);
+
+	this.viewControllers = [];
+}
+
+require('util').inherits(MenuModule, PluginModule);
+
+MenuModule.prototype.enter = function(client) {
+	
+};
+
+MenuModule.prototype.leave = function() {
+	this.viewControllers.forEach(function onVC(vc) {
+		vc.detachClientEvents();
+	});
+};
+
+MenuModule.prototype.addViewController = function(vc) {
+	this.viewControllers.push(vc);
+	return vc;	//	allow var vc = this.addViewController(new ViewController(...));
+};