Imagers only updates in the render delegate #1410
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Changes proposed in this pull request
We're adding a flag to the HdArnoldNodeGraph class to specify if this is an imager graph.
When it's modified interactively, instead of pausing and restarting the render, we update directly the arnold scene, and then notify arnold that the imagers were update (through the AiRenderHints APIs).
This allows the imagers to be updated without necessarily restarting the render
Issues fixed in this pull request
Fixes #1320