mod_tombstones: Add a very basic test case

mod_tombstones: Remember deleted accounts #1307 Presence subscriptions are normally revoked on account deletion, which informs the contact. Sometimes this notification gets lost e.g. due to s2s problems. The accounts JID may also be present e.g. in MUC affiliations, chat group member lists, pubsub subscriptions or other systems. These may grant privileges which would fall to someone who creates the same account again, which this module is meant to prevent.

mod_smacks: Compact code using new stanza API

mod_http: Clean up redirects handlers for wildcard on http module unload These would previously be left behind. Probably mostly harmless except for clogging up the `debug:events()` listing in the console.

mod_smacks: Use more compact resumption tokens UUID seems like insane overkill for something user-scoped and not security-sensitive. All that is needed is to avoid conflicts among what should be relatively long-lived sessions.

util.id: Add a 'tiny' variant Conversations uses this for its randomized resources. Presumably fine and collision resistant enough when you have a few devices at most.

util.id: Adjust entropy levels, with rationales Modules using ids for logging should not need the now pretty large medium one.

MUC: Switch ID algorithm for IQ relay (fixes #1266, #1435)

MUC: Add method for getting the occupant id salt to allow reuse

util.prosodyctl.cert: Copy SAN/wildcard certs only once