Arnold 7.3.4.0

Arnold 7.0.0.1 release.

Improving conversions between integer types. (Autodesk#889)

* Setting unsigned int parameters from int. (Autodesk#887)

* Adding more tests and conversions. (Autodesk#887)

Write custom primitives even when they already exist Autodesk#768 (Au…

…todesk#769)

Co-authored-by: Sebastien Blaineau-Ortega <sebastien.blaineau.ortega@autodesk.com>

Arnold 6.2.1.0 release.