* Add RegistrationOrder for order.
* Add sorting functionality with some tests. (See
RegistrationOrder.AbstractRegisTrationOrderSort.)
* (Except for test cases, all this is not yet in use.)
(Perhaps the sorting should be changed to use an array for output
instead of iterators, this just represents a quick way in.)
Further direction:
* Replace all the registry lists like for INotifyReload and
IDisableListener and so on within registries by a generic storage that
uses this for sorting. This way every such thing will support both
priority-based and tag-based order at the same time.
* To support different order definitions depending on what type an
interface like IRegisterWithOrder might be supported by a registry.
* Later generic event listeners might also use this, simply.
asofold