Apply all the clang-tidy modernize-* fixes

Add a paragraph describing the automated tests

Do not allow pings from resources that aren’t in the channel

fix #3252

Handle some iq of type='error' as valid ping response

fix #3251

Talk about debug logs in contributing.rst and a gitlab ticket template

Merge branch 'patch-1' into 'master'

Fix typo in CHANGELOG.rst biboumi → botan

See merge request !8

Fix typo in CHANGELOG.rst biboumi → botan

Add the archive ID to messages when they are sent to users

This makes us compatible with mam 6.0

fix #3249

Merge branch 'v4'

Run pacman -Syuu before runing the tests in archlinux

Remove two sneaky log_debug

Add a missing namespace in the server disco#info response

Respond to disco#info on MUC JIDs

Otherwise, some client won’t do MAM, since they don’t know biboumi supports
it.

Add a missing “pass by reference”

Change mam namespace to mam:2, instead of mam:1

Update changelog for 4.1 release

e2e: Display the correct number of tests that will run

Add the persistent feature in the changelog

[skip ci]

Merge branch 'persistent_chans' into 'master'

Add a Persistent option on channels

Closes #3230

See merge request !6

Do not remove our resources if the QUIT message doesn't come from us