Some Creature* casts moved to new ToCreature.

Added const Creature* ToCreature()

--HG--
branch : trunk

src/game/IdleMovementGenerator.cpp

@@ -80,7 +80,7 @@ void RotateMovementGenerator::Finalize(Unit &unit)
 {
     unit.clearUnitState(UNIT_STAT_ROTATING);
     if(unit.GetTypeId() == TYPEID_UNIT)
-        ((Creature*)&unit)->AI()->MovementInform(ROTATE_MOTION_TYPE, 0);
+      unit.ToCreature()->AI()->MovementInform(ROTATE_MOTION_TYPE, 0);
 }
 
 void
@@ -109,5 +109,5 @@ void
 AssistanceDistractMovementGenerator::Finalize(Unit &unit)
 {
     unit.clearUnitState(UNIT_STAT_DISTRACTED);
-    ((Creature*)&unit)->SetReactState(REACT_AGGRESSIVE);
+    unit.ToCreature()->SetReactState(REACT_AGGRESSIVE);
 }