MSN support

[Lucidiot]

MSN is not dead! An MSN server called Escargot is being developed on GitLab (official website here). It supports Windows Messenger 1.0 up to WLM 2009 and Yahoo! Messenger 5.0 to 5.5 currently, and plans are made for bridges to XMPP and Matrix. I am currently submitting this issue while logged on on WLM 8.5.

There are some MSNP implementations in Python, but obviously we're talking about obsolete code: msnp.py was last updated in 2004, and I found a bot implementation made in 2010 that uses a module last updated in 2001. But it does not look that hard to start maintaining that code again, and I might just get started on that if I ever have the time, and Escargot is designed to work with any version of the protocol, so that helps.