invisimail 7.x-1.0

This is a complete and total rewrite of Invisimail for Drupal 7. Gone is the old one-off clunky hard-coded mess. Now it is a pluggable, extensible framework for anti-spammer email encoding via filter, formatter, or direct API calls. Two encoders are provided, with individual configuration, and support for more is dead simple. No regex needed!

The documentation should be reasonably complete, although the invisimail.api.php file could stand to be improved a bit. It should also now be very unit testable, although those tests have not yet been written. Patches welcome. ;-)

It is my hope that this module can serve as a central router to unify the various email-encoding modules that exist. If you'd like to add more encoders, please file an issue.