Add simple mesh viewer

src/visual_elements/MeshNode.h

@@ -0,0 +1,28 @@
+#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;
+};