Run stepSimulation before moving actors

Shouldn't make too much of a difference, but a nice side effect is seeing the convexSweepTest calls for actor movements in the profiler results.

apps/openmw/mwworld/worldimp.cpp

@@ -1309,6 +1309,8 @@ namespace MWWorld
 
     void World::doPhysics(float duration)
     {
+        mPhysics->stepSimulation(duration);
+
         processDoors(duration);
 
         mProjectileManager->update(duration);
@@ -1327,8 +1329,6 @@ namespace MWWorld
         }
         if(player != results.end())
             moveObjectImp(player->first, player->second.x, player->second.y, player->second.z);
-
-        mPhysics->stepSimulation(duration);
     }
 
     bool World::castRay (float x1, float y1, float z1, float x2, float y2, float z2)