OAK-411: Validator for node type management

Change the type registration validator into an editor that also compiles the property and child node definitions into a more conveniently accessed structure.
Extend type validation to cover more cases.

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1457846 13f79535-47bb-0310-9956-ffa450edef68