* 'master' of gitlab.com:Simox/simox:
  compile fix in assert
  fixed compile error
  version bump to 2.3.70

Revert "Move urdf importer to a separate lib and always build it when all dependencies are available"

This reverts commit 7cd6f160.

- changed function signature to uint instead of int of several functions
- added function to add missing normals
- added function to add missing colors
- added function to smooth normal surface