Add support for BLE notification (ANS client).

Work In Progress!!!

src/DisplayApp/DisplayApp.cpp

@@ -38,6 +38,7 @@ DisplayApp::DisplayApp(Pinetime::Drivers::St7789& lcd,
         systemTask{systemTask} {
   msgQueue = xQueueCreate(queueSize, itemSize);
   onClockApp = true;
+  modal.reset(new Screens::Modal(this));
 }
 
 void DisplayApp::Start() {
@@ -103,6 +104,7 @@ void DisplayApp::Refresh() {
         state = States::Running;
         break;
       case Messages::UpdateDateTime:
+//        modal->Show();
         break;
       case Messages::UpdateBleConnection:
 //        clockScreen.SetBleConnectionState(bleController.IsConnected() ? Screens::Clock::BleConnectionStates::Connected : Screens::Clock::BleConnectionStates::NotConnected);
@@ -110,6 +112,15 @@ void DisplayApp::Refresh() {
       case Messages::UpdateBatteryLevel:
 //        clockScreen.SetBatteryPercentRemaining(batteryController.PercentRemaining());
         break;
+      case Messages::NewNotification: {
+        Pinetime::Controllers::Ble::NotificationMessage notificationMessage;
+        if (bleController.PopNotification(notificationMessage)) {
+          std::string m {notificationMessage.message, notificationMessage.size};
+          modal->Show(m);
+          // TODO delete message
+        }
+      }
+        break;
       case Messages::TouchEvent: {
         if (state != States::Running) break;
         auto gesture = OnTouchEvent();