Rewrite ModelFormField.java and related classes. Most of this is thread-safe now. Implemented a builder design because the original ModelForm design makes several passes over the fields - modifying them incrementally. Now ModelForm modifies builders instead, then when the parsing process is complete, the builders create the thread-safe field models.


git-svn-id: https://svn.apache.org/repos/asf/ofbiz/trunk@1647936 13f79535-47bb-0310-9956-ffa450edef68