Add button to toggle graphical LED view and default to hidden

qt/DeviceView.cpp

@@ -390,6 +390,14 @@ void DeviceView::paintEvent(QPaintEvent* /* event */)
     QPainter painter(this);
     QFont font = painter.font();
 
+    /*-----------------------------------------------------*\
+    | If Device View is hidden, don't paint                 |
+    \*-----------------------------------------------------*/
+    if(isHidden())
+    {
+        return;
+    }
+
     /*-----------------------------------------------------*\
     | If controller has resized, reinitialize local data    |
     \*-----------------------------------------------------*/