(#7165) Properties can invalidate scheduled refreshes on change

An invalidate_refreshes option can now be specified on newvalue calls inside
type definitions. When a property is changed to a value with this option set,
it causes all currently scheduled refreshes (from notify or subscribe) to be
discarded after evaluation of the resource.

This is designed for instances where a file resource is changed and refreshes
a service resource. The service itself would then be evaluated, the service is
started and then it would be refreshed, causing an additional restart. This
change allows a type definition to specify that a property change to a
particular value invalidates certain needless refreshes.