Merge branch 'projectilefix' into 'master'

Fix for projectile movement simulation (#6526 and probably #6434)

See merge request OpenMW/openmw!1518

apps/openmw/mwphysics/mtphysics.cpp

@@ -224,6 +224,7 @@ namespace
             }
             void operator()(const LockedProjectileSimulation& sim) const
             {
+                if (sim.first->isActive())
                     MWPhysics::MovementSolver::move(sim.second, mPhysicsDt, mCollisionWorld);
             }
         };

apps/openmw/mwphysics/projectile.cpp

@@ -33,6 +33,7 @@ Projectile::Projectile(const MWWorld::Ptr& caster, const osg::Vec3f& position, f
 
     mPosition = position;
     mPreviousPosition = position;
+    mSimulationPosition = position;
     setCaster(caster);
 
     const int collisionMask = CollisionType_World | CollisionType_HeightMap |