Define aligned array where the corresponding classes are defined
added child list getter that returns internal list reference
btCompoundShape wrapping done
Notes on serialization
cone shape wrapped
btConvex2dShape wrapped
btConvexPointCloudShape wrapped

Note the NOTE about implemting referenc ctors etc...
Define primitive array for btInt

This is a stopgap until I figure out a way to implement python lists to array converters
Added convex polyhedron.

Note that btConvexPolyhedron::project returns its scalar arguments in a tuple after processing.
Added cylinder shapes
Added EmptyShape (for some reason)
Added btMaterial and btMinkowskiSumShape
Needed array for scalars
Added multi sphere shape