upstream merge

mod_privilege: update to v0.4: - now the namespace "urn:xmpp:privilege:2" is exclusively used - IQ permission implementation - README update roster pushes are not implemented yet

mod_rest: Fix 'format' property in schema These are unused anyways so no harm.

mod_rest: Expand mapping of XEP-0045 join stanza The previous 'join' mapping was apparently lost in translation when swithing to datamapper, so might as well map some properties allowing history control. Usually you probably want either zero history or history since the last known time of being joined. Maybe that the former should be the default?

mod_audit: make the extension of the module API less of a hack Thanks, Zash, for making me look at mod_http.

mod_audit*: fix luacheck warnings

mod_audit*: modules for audit logging in prosody These are to be seen as proof-of-concept for now.

mod_s2soutinjection: Rewrite based on mod_onions for 0.12 compat (thanks Zash)

mod_http_muc_log: Fix exception on lack of trailing slash in room path A request to /room leads to the match call returning nil which in turn calls nodeprep(nil). In Prosody 0.11.x this does nothing and simply returns the nil, while in 0.12 it is an error. Now it redirects to the calendar view at /room/ - even for non-existant rooms. Discovered at a deployment with http_paths = { muc_log = "/" } and requests to /robots.txt and similar, which now result in a uses redirect before returning 404.

mod_rest: Fix description of extdisco endpoint (thanks MattJ) Where's the archive docs tho?