helper for user-friendly Perl/Moose command line apps

 MooseX::App is a highly customizeable helper to write user-friendly command
 line applications without having to worry about most of the annoying things
 usually involved. Just take any existing Moose class, add a single line
 (use MooseX-App qw(PluginA PluginB ...);) and create one class for each
 command in an underlying namespace.