Remove setMaterialAmbients function

Refs #1873
Fix ambient colors in collada models

Refs #1873
Fix ambient colors in collada models

Refs #1873
Fix ambient colors in collada models

Refs #1873
Update threejs drivers to store backgroundProperty and enableShadows until the renderer is ready.
Change default backgroundColor.

Refs #1873
Fix ambient colors in collada models

Refs #1873