Fix a segmentation fault when connecting to a server without a port

fix #3260

Release version 4.2

Wrong ifndef, kek

Add a missing ifnedf BOTAN_FOUND

Make botan’s policy configurable from a file

fix #3244

Remove a too old joke

Use our own proxy link to display the badges

For privacy reasons

[skip-ci]

Make sure we don’t exceed 512 bytes when grouping JOINs

Group simultaneous JOINs into a single command, to avoid flooding

We still split the JOINs with a key and the ones without

Use alpine for the docker image, and simplify the config + run stuff

Using env variable directly used by the process, it’s easier than calling
sed on the configuration file before we start the process.  Also we don’t
need to start as root anymore, and it’s a lot cleaner.

Configuration options can be overridden by setting env values

Better way to init the msghdr fields

Add a e2e test on alpine

Explicitely init the msghdr fields, to be compatible with any implementation

Remove the e2e test for the linger_time

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.

Fix the tests to take into account the new “your are exempt bla” line

Make sure the channel is joined before trying to leave it

fix #3243

Merge branch 'mam_default_limit' into 'master'

Limit of 100 MAM messages, if no other limit has been set by the client

Closes #3256

See merge request !9