Remove Shape:destroy().

With the changes to Shapes rendering them mere blocks of information with no role in the World save being attached to Bodies and discarded, Shape:destroy no longer has any justification for its continued existence. Truly, on several levels, it has been hoist with its own petard.

src/modules/physics/box2d/wrap_Shape.h

@@ -42,7 +42,6 @@ namespace box2d
 	int w_Shape_computeAABB(lua_State * L);
 	int w_Shape_computeMass(lua_State * L);
 
-	int w_Shape_destroy(lua_State * L);
 	extern "C" int luaopen_shape(lua_State * L);
 
 } // box2d