removed BVH4HAIR_WIDTH feature
removing AVX version of unaligned box intersector
cleanups of bvh4hair_intersector1
hair code also working for SSE
cleanups in mailboxing of bezier1i_intersector1
added mailbox also to bezier1_intersector1
disabling mailbox, reduced performance, setting number of bins to 16
fixing spatial binner, sorting left/right was not entirely correct
performance improvement of bounding calculation in spatial splitter
compressed nodes working with hair_builder2
bugfix in unaligned node compression
removed hair_builder1
renamed bvh4hair_builder2 to bvh4hair_builder
enabling AVX version of fast bvh4 builder