Project update

[drmfinlay]

The upstream project (Pocket Sphinx) was updated recently, so I'd like to update this project in turn. The notable changes to be made are as follows:

• Remove the old extension code altogether, since it is now quite out-of-date.
  It would be nice to make use of it, but I don't see much point.
• Release a new version of this package that requires a version of the pocketsphinx package with binaries for Python 2.7.
  This is to finalise the sphinxwrapper package and Python 2.7 support.
• Change the project name from "sphinxwrapper" to "simplepocketsphinx".
  This name is more descriptive; the callback approach used in this project is simpler if one needs to do processing when speech begins and when it ends.
• Release a new version of this package under the simplepocketsphinx name.

Since there have been many breaking changes to Pocket Sphinx, I will not be updating the project to use version 5. I may do this at some point in the future.

[drmfinlay]

One good reason to update this project to use pocketsphinx version 5, aside from upstream bug fixes, is that it is currently uninstallable on Windows using Python version 3.10 or higher. This is due to the use of a deprecated distutils symbol in the pocketsphinx version 0.1.15 installer code.