refactor: update and maintain __tres parent/objects graph

[andretchen0]

The existing parent/objects fields on __tres were unused. These are required for proper disposal of primitives – among other things.

With this PR, the parent/objects graph is now maintained when nodes are inserted and removed in nodeOps.

• parent is the parent of a TresObject
• object is any TresObject that isn't in children, i.e., an object is not inserted into the scene graph using THREE's add().

Context

This is a refactor in support of #701 . It builds on #741 .

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[andretchen0]

@alvarosabu , I've pushed changes. Does that resolve the issues you raised?

[alvarosabu]

@alvarosabu , I've pushed changes. Does that resolve the issues you raised?

Indeed, thanks for the fixes, do you want to address abstracting the utility functions in the scope of this PR or do you prefer to handle it on a future one?

[andretchen0]

@alvarosabu , I've pushed changes. Does that resolve the issues you raised?

Indeed, thanks for the fixes, do you want to address abstracting the utility functions in the scope of this PR or do you prefer to handle it on a future one?

Hey @alvarosabu ,

I've moved the out of nodeOps and simplified them in the next PR in this series, so I'll go ahead and merge here.