implement an AFM parser. It is used to parse an AFM file.
* src/psaux/psconv.c, src/psaux/psconv.h: New files to provide
conversion functions (e.g, PS real number => FT_Fixed) for the
PS_Parser and AFM_Parser. Some of the functions are taken, with some
modifications, from the psobjs.c
* src/psaux/psobjs.c: Use functions from psconv.c.
* include/freetype/internal/psaux.h, src/psaux/psauxmod.c:: Add
`AFM_Parser' to the `psaux' service.
* src/psaux/psaux.c, src/psaux/rules.mk: Include those new files.
* src/tools/test_afm.c: A test program for AFM parser.
* include/freetype/internal/services/svkern.h,
include/freetype/internal/ftserv.h: New service `Kerning'. It is
currently only used to get the track kerning information.
* src/type1/t1driver.c, src/type1/t1objs.c, src/type1/t1afm.c,
src/type1/t1afm.h: Update to use the AFM parser.
Provide the `Kerning' service.
* include/freetype/freetype.h, src/base/ftobjs.c: New API
`FT_Get_Track_Kerning'.
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