Deprecate non-essential event loops?

POE 0.2802 (CPAN) added dynamic loading for POE::Loop classes.  They
don't need to be hardcoded into POE::Kernel anymore.

Matt Cashner suggested in IRC that we split the POE::Loop classes with
external dependencies into separate distributions.

Benefits:

  Smaller base distribution.
  Fewer install questions.
  Less temptation to install big things that are seldom needed.

Drawbacks:

  Extra steps for people who want the extra event loops.

Discuss.

-- Rocco Caputo - http://poe.perl.org/