Avoid any potential int overflow

Make botan’s policy configurable from a file

fix #3244

Better way to init the msghdr fields

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

Apply all the clang-tidy misc-* fixes

Apply all the clang-tidy modernize-* fixes

Refactoring louloulibs and cmake

Use OBJECT libraries
Remove the louloulibs directory
Write FOUND variables in the cache

Pass the shared_ptr by reference, to avoid useless copies

Don’t use global static members but functions that return a reference to an internal static object

See https://github.com/randombit/botan/issues/761

Update the verify_certificate_chain code to work with botan >= 1.11.34 as well

Use the new botan 1.11.32 Tls::Client API (but stay compatible with older ones)

TLS: Enable ecc point compression

If available in Botan.

There is an issue where, if botan supports it but we don’t enable it, then
the TLS handshake may fail with some servers

Move all the connect() logic from TCPSocketHandler into a subclass

This way, TCPSocketHandler only deal with the message sending/receiving, not
the connect() or anything else.  This will be used for implementing servers
(because when a client is accepted, we don’t need all the connect() and dns
resolution stuff).

Add get-irc-connection-info adhoc command

fix #3171

Trivial cleanup

Directly use Botan::byte instead of char, to avoid an unnecessary cast

Optimize tcp_socket::on_send by using vector::erase() only once per call

Very little optimization by using a simpler scope_guard when possible

The version with the vector, that can be disabled etc, is “very” slow, so we
use unique_ptr when we don’t need to disable it, and when it only contains
one function

Fix the argument of strerror after bind()

fix coverity CID 134470

Show off, with some variadic templates, for the logger module