Test a more generic Validation approach on fields and Containers (Forms, etc)

Investigating on this field ... both on validating single fields (not only text input fields) and Container (like Forms), like in JSF.

Some reference here:
http://apache-pivot-developers.417237.n3.nabble.com/Text-validators-td3078385.html

General idea: put investigation code under /skunk and the minimal set of interfaces and classes, and the rest outside (in a dedicated subproject, here or under apache-extras).