some J3D/misc cleanup (#2628)

* some j3d cleanup

* begin using uintptr_t

* j3dgraphbase cleanup

* j3dgraphanimator cleanup

src/d/actor/d_a_peru.cpp

@@ -244,7 +244,7 @@ int daPeru_c::CreateHeap() {
         mdlData_p->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;