TrayMenu: use NPanel instead of PopupWindow

Tray, TrayDropdownPanel: use new TrayMenu
NPanel: expose animation options
shell: add TrayMenu component
i18n: add TrayMenu sub menu translation

shell.qml

@@ -92,6 +92,11 @@ ShellRoot {
     TrayDropdownPanel {}
   }
 
+  Component {
+    id: trayMenuComponent
+    TrayMenu {}
+  }
+
   Component {
     id: calendarComponent
     CalendarPanel {}
@@ -245,6 +250,9 @@ ShellRoot {
             }, {
               "id": "trayDropdownPanel",
               "component": trayDropdownComponent
+            }, {
+              "id": "trayMenu",
+              "component": trayMenuComponent
             }, {
               "id": "calendarPanel",
               "component": calendarComponent