LP#1708291: teach egIDL a new fieldmapper object representation

LP#1708291: teach egIDL a new fieldmapper object representation

This patch teaches egIDL how to represent fieldmapper objects
as objects with attributes rather than getter/setters. This
allows FM objects to be more easily bound to common to Angular
input widgets, avoiding the verbosity of getterSetter ng-options
and the fact that some widgets like uib-datepicker-popup don't
support getterSetter in the first place.

Usage is:

  hash = obj.toTypedHash()

and

  obj = new egCore.idl.fromTypedHash(hash);

Signed-off-by: Galen Charlton <gmc@equinoxinitiative.org>