Property#projecting attribute: provide redirect hints so that when the user clicks on a rendered link, the viewer instead navigates to some other entity. (also fixed in "v1 maintenance")

This was originally raised as ISIS-666, but that ticket was repurposed and rescoped to be the ability to return a different object when an action is invoked (using the RoutingService SPI service). That applies on the "response".

This ticket could be implemented through a "RedirectService" that applies on the "request".

Perhaps later on we might introduce annotations to support it also.