Add GetNewChangeDestination for getting new change Destinations
Add GetNewChangeDestination for getting new change Destinations

Adds a GetNewChangeDestination that has the same objective as GetNewDestination


Former-commit-id: 3ba9958f935296184acd01106ba2a22e9fdd4cb9
syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin