First crack at generating Termkey keyboard codes.

See: www.leonerd.org.uk/hacks/fixterms
Update the README
Fix unsigned vs signed char usage and other warnings
Don't do special things with home/end/insert keys
Meslo free font with Vim Powerline symbols included

Would like to include some decent fonts but not all of them
work with Putty.  There is some bug with the length of the font
name when it goes beyond 32 characters.  Modified this one with
Fontforge to shorten the name.  Would be better to just fix Putty....