some J3D/misc cleanup (#2628)

* some j3d cleanup

* begin using uintptr_t

* j3dgraphbase cleanup

* j3dgraphanimator cleanup

src/d/actor/d_a_obj_laundry.cpp

@@ -221,7 +221,7 @@ int daObjLdy_c::createHeap() {
         J3DJoint* joint = mpModel->getModelData()->getJointNodePointer(i);
         if (joint != NULL) {
             joint->setCallBack(nodeCallBack);
-            mpModel->setUserArea((u32)this);
+            mpModel->setUserArea((uintptr_t)this);
         }
     }