Add: Neomutt.

[contact . ng0]

Sometimes you just wait and forget about a patch and suddenly it works.
This adds neomutt, a feature patch blend of mutt which upstreams regulary into 
mutt.
This is a prominent project which is often even integrated or replaces the 
original mutt on some systems.

I was able to start it, but I no longer use neomutt myself so it requires 
either me going to sleep and trying to test it tomorrow with my current more 
complicated setup and merge this into my old configs of neomutt OR someone who 
really wants to use neomutt to give feedback if it breaks. My prediction is 
that MOST if not all features I compiled work.