* Added font substitution configuration reader, model, business logic, junit test...

* Added font substitution configuration reader, model, business logic, junit test and docs.
* Added java 1.5 generics comments to many methods.
* Performed some preparatory cleanup and refactoring which includes (but is not limited to..)
   - Creating a FontManager delegating class that is called upon when renderers are setting up fonts
   - A new FontCollection interface and concrete implementing classes to supercede the static FontSetup mechanism.

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@653826 13f79535-47bb-0310-9956-ffa450edef68