Refactoring: use using types (#6266)

* Refactoring: use using types

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Co-authored-by: Kim Kulling <kim.kulling@draeger.com>

code/AssetLib/Irr/IRRMeshLoader.cpp

@@ -121,7 +121,7 @@ void IRRMeshImporter::InternReadFile(const std::string &pFile,
 
     // final data
     std::vector<aiMaterial *> materials;
-    std::vector<aiMesh *> meshes;
+    MeshArray meshes;
     materials.reserve(5);
     meshes.reserve(5);