mod_pubsub_mqtt: Fix syntax error

mod_pubsub_mqtt: Add TLS port (default 8883) for MQTT connections

mod_http_oauth2: Reuse JWT issuance time as substitute for auth time Makes the token shorter. Since iat and auth_time are generated at about the same time they would only differ by a few microseconds anyway.

mod_poke_strangers: Fix incorrect log method calls

mod_http_muc_log: Remove compat for very old MUC API room:get_public() first appeared in 0.10.0

mod_http_admin_api: metrics: Filter out a value that is commonly nan at startup The upload bytes count is typically nan at startup, which cannot legally be encoded in JSON. I haven't assessed whether any other metrics might emit nan under other circumstances, but this fixes the most visible issue right now.

mod_groups_muc_bookmarks: Don't add deleted MUCs to user bookmarks

mod_groups_internal: Add flag to indicate when a linked MUC has been deleted In theory this shouldn't happen, but it could (and apparently does).

mod_groups_internal: Also remove MUCs that still exist, but have been destroyed Tombstones could previously fool us into thinking the MUC was still there.

mod_groups_muc_bookmarks: Sync bookmarks when user is added/removed to/from multi-MUC group This was overlooked when multi-MUC support was first implemented.