util.dns: Replace base16 implementation with util.hex Less code!

core.certmanager: Relax certificate filename check #1713 After a survey of ACME clients it seems *.crt and *fullchain* should work for the majority. The rest get to manually copy their files.

util.dependencies: Refer to 'apt' instead of 'apt-get' The more modern and user friendly frontend, should be in every supported version of Debian and Ubuntu by now

mod_invites_register: Load mod_register_ibr in invite only mode This ensures that registration actually works even if allow_registration is not enabled.

mod_invites_register: Replace COMPAT hack This hack is not needed since a9c975a0f113 so can be removed when included with Prosody.

mod_turn_external: Add option to enable TURN over TLS Usually on port 443 to avoid restrictive firewalls. Thanks to Holger for discussion

mod_turn_external: Simplify configuration Much harder to get boolean options wrong than accidentally adding something unrecognised to a Set.

mod_admin_shell: Track connected events instead of created The connection events are more appropriate here, where the s2s-created events happens a bit later or earlier in a sessions lifetime depending on its direction and for outgoing connections isn't actually the creation time (which happens immediately after pressing enter, so not very interesting), but rather closer to the connection time.

mod_s2s: Add new early s2s-connected events Allows doing things based on connections rather than sessions, which may have been created before or after.

doap: Reference some JSON RFCs RFC 4627 JSON - util.json RFC 6901 JSON Pointer - util.jsonpointer