scansion: Add tests for pubsub#itemreply in PEP

scansion: PEP notifications no longer carry 'publisher' by default Previous behaviour: - publisher was always included in PEP notifications - publisher was never included in get_items requests New behaviour: - publisher is included in both notifications and retrieval if itemreply == publisher - publisher is not ever included if itemreply ~= publisher

mod_pep: Pass node/service objects to broadcaster when resending last item This gives the broadcaster access to the node configuration, which is now important for itemreply. It probably also fixes a bug with the notify_* node config options?

mod_pubsub/pubsub.lib: Fix accidental name/var swap (thanks scansion)

mod_pubsub, mod_pep: Support per-node configurable inclusion of publisher This matches ejabberd's behaviour, using the 'pubsub#itemreply' config option. Although the current definition of this option in the specification is not as clear as it could be, I think matching what existing deployments do is the best option to resolve the ambiguity and reduce fragmentation. We should update the spec to be clearer about how to use and interpret this option. The 'expose_publisher' option for mod_pubsub is now an override (always expose or never expose). If unset, it will use the per-node config (which defaults to not exposing). Thanks to Link Mauve, edhelas and goffi for sparking this feature.

mod_tokenauth: Fix traceback in get_token_session() Errors in sha256 becasue `token_secret` is nil since it was not passed to _get_validated_token_info(). Looks like a simple oversight in ebe3b2f96cad

CHANGES: Add keyval+

features: Add "keyval+"

storagemanager: Add keyval+ (combined keyval + map) store type This combines the two most common store types, which modules often end up opening with both interfaces separately anyway. As well as combining them, I've taken the opportunity to improve some of the method names to make them clearer.

core.features: Add feature for prosody.loader Allows modules explicit dependencies upon its availability