OF-2537: Advertise support for pubsub's 'multi-item' feature XEP-0060 defines, amongst many others, the 'multi-items' service discovery feature.
This feature can be advertised by a pubsub service, when clients are allowed to configure a node in such a way that it can accept more-than-one item, by:
- setting `persist_items` to `true`
- setting `max_items` to a value higher than 1.
OF-2525: Deprecate non-persisting XMLProperties API
This aims to prevent accidental usage of XMLProperties instances that cannot persist changes. This is achieved by deprecating all constructors that create such an instance, replacing them with an aptly named static method.
Dan Caseley <dan@caseley.me.uk>
15933dd3833af8898f114106e11722ff213abb2d
OF-2415: Allow empty plugins directory at boot time in Docker entrypoint
