int32 StaticMeshImportVersion
The import version of the static mesh when it was assign this is update when:
The user assign a new staticmesh to the component
The component is serialize (IsSaving)
Default value is BeforeImportStaticMeshVersionWasAdded
If when the component get load (PostLoad) the version of the attach staticmesh is newer then this value, we will remap the material override because the order of the materials list in the staticmesh can be changed. Hopefully there is a remap table save in the staticmesh.