Bullet Physics in D

[BLM768]

A while back, I tried porting Bullet Physics to D, and I decided 
to resume work on it. I've got the code I've ported so far at 
sourceforge.net/projects/bulletd. I wrote most of the code when I 
was early in my D learning experience, so it's fairly rough, and 
it's nowhere near complete (a rough line count analysis gave well 
under 5%), but it's a start. If anyone wants to help, it would be 
appreciated.

My main reasons for making a port rather than a binding are that 
SWIG doesn't like nested classes, so it's useless for Bullet, and 
I wanted to integrate it with the GC. D and C++ are close enough 
that getting a port of at least the basic features shouldn't take 
too long; I'm not sure what I'll end up doing about the OpenCL 
options and such.