Revert "Add a linger_time configuration option on IRC servers"

This reverts commit 5d801ddcd025f68d2ec91edf0462091a32c779c1.

Revert "Cancel the IRC server linger timer when we try to-rejoin a channel on it"

This reverts commit 45f7396c8d30ed37570c4ecdaa886388f9beba3e.

Make sure the channel is joined before trying to leave it

fix #3243

Fix wrong JID computing when sending iq ping or version in fixed mode

fix #3259

Properly handle multiline topics

fix #3254

Apply all the clang-tidy performance-* fixes

Apply all the clang-tidy modernize-* fixes

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

fix #3252

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

This makes us compatible with mam 6.0

fix #3249

Remove two sneaky log_debug

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

Add a Persistent option on channels

fix #3230

Revert "Don’t send the unavailable presence to all resources, in the virtual channel"

This reverts commit 38ff50f5d2ca356f659429ff57546bd2364a0fef.

Don’t send the unavailable presence to all resources, in the virtual channel

Pass the shared_ptr by reference, to avoid useless copies

Cancel the IRC server linger timer when we try to-rejoin a channel on it

grammar: than <-> as

Add a linger_time configuration option on IRC servers

Send iq error/result when the user changed a MODE command  with an iq

And add tests for all the mode changes