cleanup data after file is no longer needed

QtMeshViewer/Header/FileInterface.h

@@ -62,6 +62,25 @@ public:
 	{
 		// close file
 		m_file.close();
+
+		//clean up
+		m_textureNames->clear();
+		delete m_textureNames;
+
+		for (Model* modelIt : *m_models)
+		{
+			for (Segment* segIt : modelIt->segmList)
+			{
+				segIt->indices.clear();
+				segIt->vertices.clear();
+				delete segIt;
+			}
+			modelIt->segmList.clear();
+
+			delete modelIt;
+		}
+		m_models->clear();
+		delete m_models;
 	};
 
 protected: