3351 fix many actors performance hit #3366
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Avoid using filter() and includes() that are slow operations. issue Kitware#3351
Provide the previously found view node to avoid a full search each time a prepass of buildPass is done issue Kitware#3351
enforceOrder was forcing the dataObjs nodes to be the first children. That had the disadvantage to make the OpenGLCamera the last item, and slow to be found. Instead, enforceOrder now simply enforce that the created missing nodes are following each others. fix #3497
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Context
Rendering is slow when a scene has many actors. This is slow since addMissingNodes() enforceOrder has been added.
Results
Performance should be back to before what they were before enforceOrder was added.
Changes
Add caching for OpenGLCamera node and do not enforce data objs to be at the beginning of the children list.
PR and Code Checklist
npm run reformatto have correctly formatted codeTesting