[F4-users] Scene improvements in CVS

[J. P. <ja...@37...>]

I've checked a couple of major improvements to the scene package into
CVS. I replaced the clumsy entity tree traversal code with a real
"visitor" pattern, don't know why I didn't do that in the first place,
brain cramp I guess. I was able to remove a lot of redundant code as
a result. I also reworked the collision detection pass, so now instead
of checking every object against every other object, it only checks
objects that have moved (against every other object). Small steps ;)
The next step is to keep a bounding volume on every entity and
perform culling in the render and collision passes, coming soon.

Jason
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