Don't allow Creatures with no movement abilities to move (Fixes #1457)

apps/openmw/mwclass/creature.cpp

@@ -345,7 +345,9 @@ namespace MWClass
         getCreatureStats(ptr).setAttacked(true);
 
         // Self defense
-        if (!attacker.isEmpty() && ptr.getClass().getCreatureStats(ptr).getAiSetting(MWMechanics::CreatureStats::AI_Fight).getModified() < 80)
+        if (!attacker.isEmpty() && ptr.getClass().getCreatureStats(ptr).getAiSetting(MWMechanics::CreatureStats::AI_Fight).getModified() < 80
+                && (canWalk(ptr) || canFly(ptr) || canSwim(ptr))) // No retaliation for totally static creatures
+                                                                  // (they have no movement or attacks anyway)
             MWBase::Environment::get().getMechanicsManager()->startCombat(ptr, attacker);
 
         if(!successful)

apps/openmw/mwworld/physicssystem.cpp

@@ -193,6 +193,11 @@ namespace MWWorld
             const ESM::Position &refpos = ptr.getRefData().getPosition();
             Ogre::Vector3 position(refpos.pos);
 
+            // Early-out for totally static creatures
+            // (Not sure if gravity should still apply?)
+            if (!ptr.getClass().canWalk(ptr) && !isFlying && !ptr.getClass().canSwim(ptr))
+                return position;
+
             /* Anything to collide with? */
             OEngine::Physic::PhysicActor *physicActor = engine->getCharacter(ptr.getRefData().getHandle());
             if(!physicActor || !physicActor->getCollisionMode())