Support deprecated behavior of point locator pointers

PointLocators have changed from being virtual objects to being trivial objects. Part of this change means that when a worklet gets the execution object for a point locator, it gets the actual object (or a reference to it) instead of a pointer to an object. This means that the new code uses the . operator to access the locator's features instead of the -> operator.

To support code still using the deprecated functionality, added a specific -> operator to the locator execution object to make it behave as if it were a pointer. However, this operator is marked deprecated to warn the user that they should modify their code to use the . instead.