some J3D/misc cleanup (#2628)

* some j3d cleanup

* begin using uintptr_t

* j3dgraphbase cleanup

* j3dgraphanimator cleanup

src/d/actor/d_a_obj_swpropeller.cpp

@@ -115,7 +115,7 @@ int daObjSwPr_c::Create() {
 
     J3DJoint* jnt = mpModel->getModelData()->getJointNodePointer(mKaitenJntID);
     jnt->setCallBack(nodeCallBack);
-    mpModel->setUserArea((u32)this);
+    mpModel->setUserArea((uintptr_t)this);
 
     eyePos.y += 100.0f;