coretext: replace CT attr reads with freetype lookups
coretext: replace CT attr reads with freetype lookups

This makes results much more consistent with other platforms,
particularly around cases where fonts have multiple conflicting names.

Akemi/libass,astiob/libass,ShiftMediaProject/libass,MrSmile/libass,Akemi/libass,ShiftMediaProject/libass,MrSmile/libass,xbmc/libass,libass/libass,astiob/libass,xbmc/libass,libass/libass,Akemi/libass