Rolling KD-Tree?

Hrm thanks Kev. I should have thought about 2. I didn't see any obvious way to remove points on the tree I'm using (Rednaxela) but it looks like it does support a max size! :facepalm how did I not notice that before? Sigh. Always the simple things!

Adding point removal isn't hard, the hard thing is to keep the right tree structure, which I haven't seen in most implementation, which is necessary to keep the tree performant.

Removing a point is essentially:

1. search it as normal.
2. iterate through each of the bucket and erases it.