[mythtv] New Plugin MythPython and two new MythUITypes for libmythui

[Justin Hornsby]

The whole reason Microsoft would have deemed XBMC illegal is the very
fact that it needs _STOLEN_ software to build it.  You can't get the
XDK from legitimate sources unless you're an accredited MS software
developer. That's why XBMC is illegal.  There's also the fact that you
can only run XBMC on an xbox with hacked firmware, something else
which isn't 100% legal either.

I'm going to stay out of the whole python vs 'proper code' debate, but
I don't think this is going to lower the bar for contributors very
much at all.