Commits on Jul 2, 2014

1. First part of font refactoring. These changes simplify a few things …

   but don't do much on their own, they just make it easier to
   implement the work to come (web fonts, performance improvments
   in terms of font loading and memory usage).
   
   - Font identifier on Linux/Android is now the font file path.
     This is a temporary measure, but simplifies things a lot for now.
   - Remove FontListHandleMethods trait in favour of free functions.
   - FontList::refresh() has no knowledge of FontFamily etc. Instead it takes
     a closure that the caller provides.
   - FontList::load_variations_for_family no longer creates the font
     handle. Instead it takes a closure and provides the name of the font
     identifier for the variations it finds.
   - Remove path_from_identifier() - it's no longer required.
   - create_font_from_identifier() takes an Option<Style>, allowing it to be
     used to create fonts for family matching purposes where the font size is
     not important.
   
   Tested on Linux + Mac. Builds on Android but not able to confirm it's working correctly.

   

   gw3583 committed Jul 2, 2014

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