Libtermdraw: Terminfo support has landed.

[Ori Bernstein <ori@xxxxxxxxxxxxxx>]

I've finally landed the terminfo based `libtermdraw` code.

This code shouldn't look too different, but it should work
far more reliably on all terminal types, and adds support for
a few new event types.

It also opens the door to a lot of new stuff. It will be easy
to support large number of new key sequences, mouse events,
and many other features that you might expect from a terminal
handling library.

Many thanks to npth (S. Gilles), who did a large part of the
heavy lifting in getting this ready.

Some missing bits include support for hashed terminfo databases,
which seems to mainly be used on FreeBSD these days. The ANSI
terminal fallback will be used there.

-- 
    Ori Bernstein