Properly handle multiline topics

fix #3254

Refactoring louloulibs and cmake

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

Replace all include guards by #pragma once

It’s $CURRENT_YEAR

Refactor, test and improve the way we cut too-long messages for IRC

Introduce the configure ad-hoc command on irc servers

Provides two options for now, and they have no effect yet