BufferGeometry support

[SuberFu]

I noticed that there's no support for BufferGeometry (both for point cloud and faces). Is the lack of support intentional or just on the "todo" list?

I can see where it might go in the addDeferred() function. Although not 100% sure how automated it can be made (perhaps the options need to include parameter to treat the buffergeometry as a point cloud, triangle, and/or from which bufferattribute to read from).

[collinhover]

My apologies, this project has been on hold as my time is required elsewhere. However, I'm always available to review and merge pull requests.

In case anyone is interested in working on this, when you add a THREEJS object to the octree, the octree object that wraps it needs only a position and radius. You'd need to update:

• Octree Object constructor to account for a new type of object (ex point cloud): https://github.com/collinhover/threeoctree/blob/master/threeoctree.js#L664
• Octree Object update method to calculate correct position and radius: https://github.com/collinhover/threeoctree/blob/master/threeoctree.js#L714