A little font configuration cleaning.
* Extracted business logic from PrintRendererConfigurator and created a new FontDetector and FontAdder in org.apache.fop.fonts package.
* Created a new FontInfoConfigurator that factors out a lot of the static stuff in PrintRendererConfigurator.
* PDFDocumentGraphics2DConfigurator now uses a new FontInfoConfigurator() instead of static PrintRendererConfigurator.buildFontListFromConfiguration() call.
* static method updateReferencedFonts() in PrintRendererConfigurator moved to an instance method in FontManager.
git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@756522
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