[!!!][FEATURE] Improve default routing for entities
This improves the default dynamic route part handler so that it
can resolve objects that are known to the persistence manager.
If the routing comes across an object when creating an URI, the
identifier (UUID) of the object is used to resolve the URI part.
This is a breaking change, because routes with dynamic parts now
also match objects even if no custom route part handler is used.
Will now result in the URI "posts/<UUID>"