App Wizard updates for form validation implementation.
Another package restructuring, this time pulling everything which once
was in the appWizards package down one level.
Refactored the wizard such that it is not longer necessary to create a
wrapper class for every field. Now, any special use field we require
(which isn't already implemented by GXT) can be developed as a
stand-alone field widget. This field can then be wrapped in a converter
for use in the app wizard.