Fix the stackOverflow issue in #54

[madhephaestus]

This is a fix to the stack overflow issue in the plane split function. If a plane that comes in that is not as flat as the fixed Plane.EPSILON value, then the algorithm would recourse until a crash.

This change measures the epsilon off of the incoming polygon to set the epsilon values accurately for each incoming polygon.

[CreamyCookie]

@madhephaestus When I enable this the icosahedron.intersect assert of the IcosahedronTest fails

[madhephaestus]

This feature should be implemented in neuronrobotics/jcsg along with lots of additional features. I made this pr in hopes the upstream project was not abandoned, but alas, it seems the neuronrobotics fork seems to the the currently maintained fork.

[CreamyCookie]

@madhephaestus Oh, maybe I should have mentioned.. I applied the changes to your fork, and there the test failed.

[madhephaestus]

My fork already has this feature. This PR is intended to back-feed solutions to begs to the ubstream project, in case someone is stock on this fork for some reason. There is no need to apply this to my fork.

[CreamyCookie]

@madhephaestus Ah, I see, my bad

Thank you for your fork 👍