implemented rotation
added mediocre grid antialiasing (shoot at 4 corners and average)
added octree. not very good. needs lots of tweaking.
not sure.... might trash octree
miscommit
something funky is happening with tri-AABB intersect. hmm.
prep commit to change from vector :-> point, vector
fixed vectors -> vector, point. messed something up. commiting, but will debug later
removed octree because i'm stupid and don't know how it should work properly.