Convert to use Moo

Any::Moose is deprecated, so this is a conversion to use Moo instead.  Existing tests all pass.

One complication: if an existing module uses Any::Moose and extends this, it will most likely use Mouse by default, and then break.

Specifically, this is almost certain to break Prophet::Config.  I haven't yet looked at its code, so I don't know how hard it would be to convert it to use Moo or possibly just Moose.  If it will help this patch get in I can work on converting Prophet::Config to use Moo, although I'm not particularly interested in converting the rest of Prophet.