UIMA-3920
- delegate feature expressions to MacthReferences and back again, in order to parse long type names with feature references not before runtime when the types are available
- needed to change some interfaces, especially in FeatureExpression
- added test
- fixed validator in workbench

git-svn-id: https://svn.apache.org/repos/asf/uima/ruta/trunk@1628994 13f79535-47bb-0310-9956-ffa450edef68