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ref #2472

Our CTCP notice didn't include a \01 char at the end.  We thus failed to
check the PING id when we received it ourself, because one char was missing

fix #2694

fix #3041

Instead of ignoring the stanza, we send back an error of type
remote-server-not-found each time it's possible.

Also avoid having to do if (!irc) return; everytime.

fix #3045

fix #3042

This way, the users can receive the result of any IRC command (although not
parsed nor formatted in anyway) when biboumi doesn’t support it

fix #2884

Messages received on an IRC server JID are forwarded as raw IRC messages.

fix #2486

This environment variable points to the location the user expects to
find every program’s config file, or if it isn’t set, ~/.config/biboumi
(with a fallback to . if $HOME isn’t set).

fix #2553

Note, in our context, is_connecting() includes the resolving part as well as
the actual connection (if we are using c-ares)

fix #3048

fix #3047

This reverts commit ad0465b3.

Conflicts:
	louloulibs

To avoid doing a double exit when receiving bot SIGINT and SIGTERM

This let users send message to nicks such as Q@CServe.quakenet.org

fix #3047

Only keep some biboumi-specific commands into biboumi_adhoc_commands.hpp/cpp

Because apparently when cloning a repository with submodules, git creates
empty sub-directories

ref #2472

in this order:
- Make sure it is utf-8 encoded
- Remove all chars that are invalid in XML
- Escape all XML special chars (&'"<>)