3D model vertex normals are now calculated in parallel
Fixed a few code style issues, added #ifdef USE_OPENMP
Added comment to ifdef for USE_OPENMP
Fixed code style issue in existing code
FIxed invisible layers problem after changing the number of layers (GAL).
Merged with lp:kicad
3D viewer: Parallelized 3D model vertex normal calculations to use all available CPU cores for significant speedup.