Remove mpGameScene member from KBlocksView
KBlocksView actually stored two pointers to the same Scene object. The parent QGraphicsView stores a QGraphicsScene pointer, accessible via scene() and setScene(). And KBlocksView also stored a SceneInterface pointer as a private member function. This could lead to confusing behavior. For example, calling setScene() on the KBlocksView object only replaces one of the two pointers. I have removed the private mpGameScene member. The scene is now always accessed via the scene() interface.
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