Besides some more bugfixes, I introduce starting language SayScripts for
the subset defined in say.conf. They are not finished yet, mainly the
number scripts are present. The rest have yet to be added.

But, at least, en is ready, and passing the test suite. At least,
as far as I can tell so far.

I also introduce some scripts to help collect the saysentence formats
from the Asterisk source tree. Another script will help with dialplan
usage, but that's for later.