Manually fix up 100 more instances where it should be defaulted

code/PostProcessing/OptimizeMeshes.cpp

@@ -71,9 +71,7 @@ OptimizeMeshesProcess::OptimizeMeshesProcess()
 
 // ------------------------------------------------------------------------------------------------
 // Destructor, private as well
-OptimizeMeshesProcess::~OptimizeMeshesProcess() {
-    // empty
-}
+OptimizeMeshesProcess::~OptimizeMeshesProcess() = default;
 
 // ------------------------------------------------------------------------------------------------
 // Returns whether the processing step is present in the given flag field.