This change abstracts the Renderer away from FOTreeHandler as follows:

This change abstracts the Renderer away from FOTreeHandler as follows:

Old:
driver-->fotreehandler-->areatree
                     \-->renderer

New:
driver-->fotreehandler-->areatree-->renderer

I am hoping this will streamline the code more.
Main drawback I can see is that the AreaTree constructor
gets a bit ugly--from one parameter, the Renderer,
to four (the items needed to create a Renderer.) Perhaps
we can have AreaTree construct the FontInfo object in the
future, dropping us to a three-parameter constructor.

Comments welcome.

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@197754 13f79535-47bb-0310-9956-ffa450edef68