Drop support for botan < 2.0

fix #3274

Improve the handling of the biboudb.hpp dependencies

Apply all the clang-tidy performance-* fixes

Apply all the clang-tidy misc-* fixes

Refactoring louloulibs and cmake

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

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

Refactor load_certs()

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

Add a TEMPORARY work-around for botan 1.11.29

Rename BasicCredentialManager

Support a trusted SHA1 fingerprint to be configured for each IRC server

Make the CA file configurable

Provide an adhoc option to let user pass the cert verif for some IRC servers

Fix the build without botan, caused by credentials_manager

Verify TLS certificate with the given hostname, instead of a hardcoded one

Verify the remote TLS certificates using the system-wide trusted CAs