Fix approx_eql() in Mat4
Replace deprecated Share trait name with Sync
Handle BBox intersection degenerate case.
Play it safe and check for t_min < t1

Even though my brain tells me only t_max > 0.0 is required
Clamp colour at subpixel level

Try to avoid SSAA artifacts when subpixels have extreme values
Octree: improve performance by removing intermediate vectors

This patchset also removes vector-based prim storage