`switch' statement to make it run faster.
(ah_outline_compute_segments): Reset `segment->score' and
`segment->link'.
(ah_outline_link_segments): Provide alternative code which does
the same but runs much faster.
Handle major direction also.
(ah_outline_compute_edges): Scale `edge_distance_threshold' down
after rounding instead of scaling comparison value in loop.
* src/autohint/ahhint.c (ah_hinter_align_stong_points): Provide
alternative code which runs faster.
Handle `before->scale == 0'.
* src/autohint/ahtypes.h (AH_SegmentRec): Move some fields down.
(AH_EdgeRec): Move some fields in structure.
New field `scale'.
* src/sfnt/ttcmap0.c (tt_cmap4_char_next): Use binary search.
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