Add userspace reboot/restart

Update SessionMenuTab.qml

Update CompositorService.qml

Update settings-default.json

Update en.json

Update SessionProvider.qml

Update LockScreenPanel.qml

Update SessionMenuEntrySettingsDialog.qml

Update SessionMenu.qml

Modules/LockScreen/LockScreenPanel.qml

@@ -88,6 +88,9 @@ Item {
     case "reboot":
       CompositorService.reboot();
       break;
+    case "userspace-reboot":
+      CompositorService.userspaceReboot();
+      break;
     case "shutdown":
       CompositorService.shutdown();
       break;