Irccd: finish custom IRC library, closes #581 Finally remove the lovely libircclient that has been used since the beginning of irccd back in 2013. Several issues made the choice of developing a custom IRC library: - libircclient requires select(2) system call and works in procedural paradigm which is incompatible with our Boost.Asio main loop, - there was no way in the libircclient to detect custom message like PING to handle dead servers, this required to bundle the library within the application, - the library use static output buffer which requires to keep an internal queue of commands that we flush at each iteration.

--- a/CREDITS.md	Thu Nov 23 22:45:12 2017 +0100
+++ b/CREDITS.md	Fri Nov 24 20:05:15 2017 +0100
@@ -5,7 +5,8 @@
 ----------------------
 
 - libircclient, http://www.ulduzsoft.com/linux/libircclient
-  Very powerful and great C IRC library.
+  Very powerful and great C IRC library used until version 3.0.0, has been a
+  source of inspiration.
 
 - OpenSSL, http://openssl.org
   Free, open-source famous crypto library.