Dezzles

Namespace QuadTree system

2

As suggested in https://github.com/CodingTrain/QuadTree/pull/37 We should move QuadTree classes into namespaces As recommended by @shiffman, one of - ```QuadTree``` - ```qt``` - ```qt5```

Feature - mobile friendliness

1

Updates to make the application, especially the guitar view, more friendly for mobile users