Changed: CgFXMaterial now sets the SortKey of it's techniques whenever the CgFXMaterial's SortKey or Techniques changes.
Changed: CgFXMaterial now sets the SortKey of it's techniques whenever
the CgFXMaterial's SortKey or Techniques changes.

Signed-off-with-cleanup-by: gerrit <788f206ccdc6f0273070dd892b0148035dd2ebe5@vossg.org>

jondo2010/OpenSG,jondo2010/OpenSG,jondo2010/OpenSG,jondo2010/OpenSG,jondo2010/OpenSG