enhanced ModuleActions component to display panes in a submenu, added more containers to Oqtane theme, added more panes to MultiPane layout, added module outline in edit mode to distinguish modules in panes, consolidated to use a single default AdminPane named "Content", fixed bug related to custom Admin Container behavior

Oqtane.Server/wwwroot/js/app.js

@@ -0,0 +1,8 @@
+function subMenu(a) {
+    event.preventDefault();
+    event.stopPropagation();
+
+    var li = a.parentElement, submenu = li.getElementsByTagName('ul')[0];
+    submenu.style.display = submenu.style.display == "block" ? "none" : "block";
+    return false;
+}