Fix hierarchy of lua-exported classes.

New luabind performs automatic cast to most derived class, which causes crash
when trying to call parent class function from lua.

src/xrGame/PhysicObject_script.cpp

@@ -13,8 +13,6 @@ SCRIPT_EXPORT(CPhysicObject, (CGameObject),
 {
 	module(luaState)
 	[
-		class_<CDestroyablePhysicsObject,CGameObject>("CDestroyablePhysicsObject")
-			.def(constructor<>()),
 		class_<CPhysicObject,CGameObject>("CPhysicObject")
 			.def(constructor<>())
 			.def("run_anim_forward",				&CPhysicObject::run_anim_forward)
@@ -25,6 +23,8 @@ SCRIPT_EXPORT(CPhysicObject, (CGameObject),
 			.def("play_bones_sound",				&CPhysicObject::play_bones_sound)
 			.def("stop_bones_sound",				&CPhysicObject::stop_bones_sound)
 			.def("set_door_ignore_dynamics",		&CPhysicObject::set_door_ignore_dynamics)
-			.def("unset_door_ignore_dynamics",		&CPhysicObject::unset_door_ignore_dynamics)
+			.def("unset_door_ignore_dynamics",		&CPhysicObject::unset_door_ignore_dynamics),
+        class_<CDestroyablePhysicsObject, CPhysicObject>("CDestroyablePhysicsObject")
+            .def(constructor<>())
 	];
 });

src/xrGame/ai/stalker/ai_stalker_script.cpp

@@ -16,11 +16,11 @@
 
 using namespace luabind;
 
-SCRIPT_EXPORT(CStalkerPlanner, (),
+SCRIPT_EXPORT(CStalkerPlanner, (CScriptActionPlanner),
 {
 	module(luaState)
 	[
-		class_<CStalkerPlanner>("stalker_ids")
+		class_<CStalkerPlanner, CScriptActionPlanner>("stalker_ids") // CScriptActionPlanner
 			.enum_("properties")
 			[
 				luabind::value("property_alive",							StalkerDecisionSpace::eWorldPropertyAlive),