Clean up of scene nodes to support 2d and non int positioning.

src/visual_elements/MeshNode.h

@@ -1,28 +0,0 @@
-#pragma once
-
-#include "MaterialNode.h"
-
-class AbstractMesh;
-
-class MeshNode : public MaterialNode
-{
-public:
-    MeshNode(const DiscretePoint& location);
-    void setMesh(AbstractMesh* mesh);
-
-    SceneItem* getSceneItem(std::size_t idx) const override;
-    unsigned getNumSceneItems() const override;
-
-    void setWidth(unsigned width);
-    void setHeight(unsigned height);
-
-    void update(FontsManager* fontsManager) override;
-
-private:
-    bool mMeshIsDirty{true};
-    AbstractMesh* mWorkingMesh{nullptr};
-
-    unsigned mWidth{1};
-    unsigned mHeight{1};
-    std::unique_ptr<SceneModel> mModel;
-};