some J3D/misc cleanup (#2628)

* some j3d cleanup

* begin using uintptr_t

* j3dgraphbase cleanup

* j3dgraphanimator cleanup

src/d/actor/d_a_npc_bou.cpp

@@ -257,7 +257,7 @@ int daNpc_Bou_c::CreateHeap() {
         modelData->getJointNodePointer(i)->setCallBack(ctrlJointCallBack);
     }
 
-    model->setUserArea((u32)this);
+    model->setUserArea((uintptr_t)this);
     mpMatAnm[0] = new daNpcT_MatAnm_c();
     if (mpMatAnm[0] == NULL) {
         return 0;