Support for adding (refitted) additional 'aggregate data' to BinaryBVH'es, and a tempalte for N-body style traversals - #23
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To allow for a request that asked for an n-body style use case this PR adds
a) some additional refit options (currently CUDA only) that allows for refitting additional "aggregate" node data
b) a new traversal template that allows for some user-lambdas to cull or approximate subtrees based on this aggregate data
c) some n-body style sample in which each point computes sum(1/dist^2) to all other points, using the new traversal template to approximate subtrees far away from the respective query point using that aggregate data.