Core/Movement: MovementGenerator fixes.

- vmap height search in FleeingMovementGenerator and ConfusedMovementGenerator (until we can search for a nearby position properly) Should solve #7704, needs testing
- Removed some unused code in CalculatePath and TargetedMovementGenerator. Ty faramir118
- Allow players to charge through slime and lava liquids. Closes #7967

src/server/game/Movement/Spline/MoveSplineInit.cpp

@@ -98,7 +98,7 @@ namespace Movement
         if (!args.HasVelocity)
             args.velocity = unit->GetSpeed(SelectSpeedType(moveFlags));
 
-        if (!args.Validate(&unit))
+        if (!args.Validate(unit))
             return 0;
 
         if (moveFlags & MOVEMENTFLAG_ROOT)