Teapot enhancements

[JerBoon]

Currently it's a little sub-optimal

• I've omitted a few of the triangular vertices off the top of the knob
• The axis alignment code needs adding
• The scaling is only approximate
• Alignment of surfaces, in terms of normal direction is haphazard (in a way that's moot since it won't really work too well as a transparent object, as the hole in the spout will give weird results)
• Could really do with some sub-bounding, around various intensive parts of the whole - e.g. the spout, handle, knob on the top...

[JerBoon]

Turns out, it's a really good test of the engine - and an excellent demo that I need to get on top of the spatial indexing.
When in "view" the teapot MASSIVELY slows the ray trace - while it checks every ray for intersection of every triangle
When not in view, everything goes MUCH quicker