Build type information on first use (load-time), instead of using a hardcoded list

--HG--
branch : dynamiccore2

src/modules/physics/box2d/wrap_Shape.cpp

@@ -30,7 +30,7 @@ namespace box2d
 
 Shape *luax_checkshape(lua_State *L, int idx)
 {
-	return luax_checktype<Shape>(L, idx, PHYSICS_SHAPE_ID);
+	return luax_checktype<Shape>(L, idx, Shape::type);
 }
 
 int w_Shape_getType(lua_State *L)
@@ -108,7 +108,7 @@ const luaL_Reg w_Shape_functions[] =
 
 extern "C" int luaopen_shape(lua_State *L)
 {
-	return luax_register_type(L, PHYSICS_SHAPE_ID, "Shape", w_Shape_functions, nullptr);
+	return luax_register_type(L, Shape::type, "Shape", w_Shape_functions, nullptr);
 }
 
 } // box2d