[autofit] Add code for reverse charmaps and adjustment database lookup. * src/autofit/aftypes.h (AF_ReverseMapEntry, AF_ReverseCharacterMap): New structures. * src/autofit/afadjust.c (af_adjustment_database_lookup, af_reverse_character_map_entry_compare, af_reverse_character_map_lookup, af_lookup_vertical_separation_type, af_lookup_tilde_correction_type, af_reverse_character_map_expand, af_reverse_character_map_new, af_reverse_character_map_done): New functions. * src/autofit/afadjust.c: Updated.