Manually fix up 100 more instances where it should be defaulted

code/PostProcessing/FixNormalsStep.cpp

@@ -59,17 +59,11 @@ using namespace Assimp;
 
 // ------------------------------------------------------------------------------------------------
 // Constructor to be privately used by Importer
-FixInfacingNormalsProcess::FixInfacingNormalsProcess()
-{
-    // nothing to do here
-}
+FixInfacingNormalsProcess::FixInfacingNormalsProcess() = default;
 
 // ------------------------------------------------------------------------------------------------
 // Destructor, private as well
-FixInfacingNormalsProcess::~FixInfacingNormalsProcess()
-{
-    // nothing to do here
-}
+FixInfacingNormalsProcess::~FixInfacingNormalsProcess() = default;
 
 // ------------------------------------------------------------------------------------------------
 // Returns whether the processing step is present in the given flag field.