[cairo] Renaming ATSUI font to Quartz font

[Vladimir Vukicevic]

Here's a patch that renames the current ATSUI font backend to a Quartz  
font backend, in preparation for eventually dropping the ATSUI  
dependancy internally and using CGFont directly.  This patch makes -- 
enable-quartz give you both quartz surface and quartz font support;  
otherwise, I would've needed to use "cairo-quartz-font.h", breaking  
the usual pattern.  I also can't think of a reason to compile with  
just one of those -- even if you only use one or the other, it won't  
hurt to have them both available (since they have the exact same  
dependencies).

The font creation function cairo_atsui_font_create_for_atsu_font_id  
was renamed to cairo_quartz_font_create_for_atsu_font_id -- the same  
API entry point can be supported even after the CGFont switch  
internally.  Also, CAIRO_FONT_TYPE_ATSUI is now  
CAIRO_FONT_TYPE_QUARTZ.  There was some mention of adding two #defines  
for the old names to cairo-obosolete.h -- but I don't see a cairo- 
obsolete.h in the current trunk dev branch.  Should I create one?

behdad, cworth, does this seem reasonable?

     - Vlad

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