Add missing Vector3 normal array transform
Implement MeshHelper.TransformScene, fixes #2546
Delegating to existing method
Back to inlining, matches rest of file better

This reverts commit 858ee5e362b54e6fe3b216b643e8afd792de9eae.
Merge pull request #2630 from SickheadGames/ModelPipeline

Implemented MeshHelper.TransformScene