making BVH4Hair builder2 deterministic
removing old bvh4hair_builder
separating primrefblock handling from hair builder
removing countfunc from hair builder
using halfArea in hair builder
removed bvh4hair visualization mode
adding 2nd version of bvh4hair builder for cleanups
removed node compression in bvh4hair builder2
moved splitting code to object split class
passing allocator to ObjectSplit::split
introducing blocks function
removing modified heuristic
calculating bounds from binning info, changes tree slightly
updates
separating object binner into own file
cleanups in spatial splits
separated spatial splitter into separate file
put fallback split into separate file
strand split splits by its own
strand split calculates bound in space defined by two axis used to partition curves