[UNITY] procedural planet octree renderer

dual contour octree realtime renderer for point cloud data or procedural planet generation
there's still work to do in order to fix the cracks between contiguous chunks with different level-of-detail (these gaps in the screenshots, in the code there should be an attempt to bruteforce the stitching, totally ugly and broken code) the algorithm used is basically dual contouring, but at the moment instead of calculating the quadratic error function I just average all the intersection points for each cell and then perform the geometry tesselation along these points, as at this stage there are no noticeable artifacts because of this oversimplification.