[autofit] Introduce data file for blue strings.

The idea is to have a central file which gets processed by a Perl
script to create proper `.c' and `.h' files using templates.  There
are two other reasons to do that:

  . The data file should be easily readable.  We use UTF-8 encoding
    which then gets converted to single bytes.

  . Since the number of supported scripts will increase soon, the
    current usage of blue string arrays is a waste of space.  Using
    the Perl script it is possible to imitate jagged arrays,
    defining enumeration constants as offsets into the arrays.

This commit only adds files without changing any functionality.

* src/autofit/afblue.dat: New data file.
* src/tools/afblue.pl: New Perl script for processing `afblue.dat'.

* src/autofit/afblue.cin, src/autofit/afblue.hin: New template files
for...
* src/autofit/afblue.c, src/autofit/afblue.c: New source files.
To avoid a dependency on Perl, we add them too.
[autofit] Add blue stringsets.

* src/autofit/aftypes.h: Include `afblue.h'.
(AF_ScriptClassRec): Add `blue_stringset' field.
(AF_DEFINE_SCRIPT_CLASS): Updated.

* src/autofit/autofit.c: Include `afblue.c'.

* src/autofit/afcjk.c (af_hani_script_class), src/autofit/afdummy.c
(af_dflt_script_class), src/autofit/afindic.c
(af_deva_script_class), src/autofit/aflatin.c
(af_latn_script_class), src/autofit/aflatin2.c
(af_ltn2_script_class): Updated.

* src/autofit/rules.mk (AUTOF_DRV_SRC): Add `afblue.c'.
[autofit] Make `latin' module use blue stringsets.

* src/autofit/aflatin.c (AF_LATIN_MAX_TEST_CHARACTERS): Removed.
(af_latin_blue_chars): Removed.
(af_latin_metrics_init_blues): Replace AF_LATIN_MAX_TEST_CHARACTERS
with AF_BLUE_STRING_MAX_LEN.
Change loops to use offsets (in file `afblue.h') into the new arrays
`af_blue_stringsets' and `af_blue_strings' (in file `afblue.c').
Use `AF_LATIN_IS_SMALL_TOP_BLUE' macro.

* src/autofit/aflatin.h: Remove old enumeration values superseded by
the new data in `afblue.h'.
(AF_LATIN_IS_TOP_BLUE): Updated definition.
(AF_LATIN_IS_SMALL_TOP_BLUE): New macro.
(AF_LATIN_MAX_BLUES): Remove.
(AF_LatinAxisRec): Updated.
[autofit] Synchronize `cjk' with `latin' module (and vice versa).

* src/autofit/afcjk.c (af_cjk_metrics_init_widths): Add tracing
messages.
(af_cjk_metrics_init_blues): Don't pass blue string array as
argument but use the global array directly.
Use `outline' directly.
Update and add tracing messages.
(af_cjk_metrics_init): Simplify code.
(af_cjk_metrics_scale_dim): Improve tracing message.
(af_cjk_metrics_scale): Synchronize.

* src/autofit/aflatin.c (af_latin_metrics_init_widths,
af_latin_metrics_init_blues): Improve and add tracing messages.
[autofit] Typo.

* src/autofit/afblue.hin, src/autofit/afblue.c (GET_UTF8_CHAR): Use
cast.
[autofit] Make `cjk' module use blue stringsets.

* src/autofit/afcjk.c (AF_CJK_MAX_TEST_CHARACTERS): Removed.
(af_cjk_hani_blue_chars): Removed.
(AF_CJK_BLUE_TYPE_*): Removed.
(af_cjk_metrics_init_blues): Replace AF_CJK_MAX_TEST_CHARACTERS with
AF_BLUE_STRING_MAX_LEN.
Change loops to use offsets (in file `afblue.h') into the new arrays
`af_blue_stringsets' and `af_blue_strings' (in file `afblue.c').
Instead of three dimensions (as used in the old blue string array)
we now use properties to do the same, saving one loop nesting level.

* src/autofit/afcjk.h: Remove old enumeration values superseded by
the new data in `afblue.h'.
(AF_CJK_IS_TOP_BLUE, AF_CJK_IS_HORIZ_BLUE, AF_CJK_IS_FILLED_BLUE,
AF_CJK_IS_RIGHT_BLUE): New macros, to be used in
`af_cjk_metrics_init_blues'.
(AF_CJK_BLUE_IS_RIGHT): Remove this now redundant enum value.
(AF_CJK_BLUE_IS_TOP): Renamed to...
(AF_CJK_BLUE_TOP): This.
(AF_CJK_MAX_BLUES): Remove.
(AF_CJKAxisRec): Updated.
[autofit] Make `dummy' hinter work as expected.

* src/autofit/afdummy.c (af_dummy_hints_init): Properly set scaling
information.
(af_dummy_hints_apply): Scale the glyphs.
[autofit] Fix script selection.

* src/autofit/afglobal.c (af_face_globals_get_metrics): Use
`AF_SCRIPT_DFLT', not value 0.
Simplify code.

* src/autofit/afscript.h: Sort by script name.
Better tracing of loaded glyphs.

Previously, the loading of a glyph was traced at level 4, if at all.
With this change, all font loading routines emit a tracing message
at level 1, making it easier to select tracing output (for example
using F2_DEBUG="any:1 afhints:7 aflatin:7").

* src/bdf/bdfdrivr.c (BDF_Glyph_Load): Add tracing message.
* src/cff/cffdrivr.c (cff_glyph_load): Ditto.
* src/cff/cffgload.c (cff_decoder_prepare): Improve tracing
messages.
* src/cid/cidgload.c (cid_load_glyph): Use level 1 for tracing
message.
* src/pcf/pcfdrivr.c (PCF_Glyph_Load): Ditto.
* src/pfr/pfrobjs.c (pfr_slot_load): Add tracing message.
* src/truetype/ttgload.c (TT_Load_Glyph): Ditto.
* src/type1/t1gload.c (T1_Load_Glyph): Ditto.
* src/type42/t42objs.c (T42_GlyphSlot_Load): Ditto.
* src/winfonts/winfnt.c (FNT_Load_Glyph): Ditto.
[autofit] Improve tracing messages.

* src/autofit/afcjk.c (af_cjk_metrics_init_widths): Mention script
ID in tracing message.
(af_cjk_metrics_init_blues): Initialize `axis' outside of the inner
loop.
Improve tracing messages.
(af_cjk_hint_edges) [FT_DEBUG_LEVEL_TRACE]: New variable
`num_actions' to count hinting actions.
Improve tracing messages.

* src/autofit/aflatin.c (af_latin_metrics_init_widths): Mention
script ID in tracing message.
(af_latin_metrics_init_blues, af_latin_hint_edges): Improve tracing
messages.
[autofit] Add support for Hebrew script.

* src/autofit/afblue.dat: Add blue strings for Hebrew.
* src/autofit/afblue.c, src/autofit/afblue.h: Regenerated.

* src/autofit/aflatin.c (af_hebr_uniranges): New array.
(af_hebr_script_class): New script.
* src/autofit/aflatin.h, src/autofit/afscript.h: Updated.
[autofit] Report used script while hinting a glyph.

* src/autofit/afcjk.c (af_cjk_hint_edges), src/autofit/aflatin.c
(af_latin_hint_edges): Implement it.
[autofit] While tracing, report script names instead of ID values.

* src/autofit/afglobal.c (af_script_names) [FT_DEBUG_LEVEL_TRACE]:
New array.
* src/autofit/afglobal.h: Updated.

* src/autofit/afcjk.c (af_cjk_metrics_init_widths,
af_cjk_hint_edges): Use `af_script_names'.
* src/autofit/aflatin.c (af_latin_metrics_init_widths,
af_latin_hint_edges): Ditto.
Whitespace.
Remove `FT_SqrtFixed' function.

It's no longer used.

* include/freetype/internal/ftcalc.h, src/base/ftcalc.c: Do it.
FT_Open_Face: Improve external stream handling.

If the font's `clazz->init_face' function wants to swap to new
stream, handling of whether original stream was external could
result to either memory leak or double free.  Mark externality into
face flags before calling `init_face' such that the clazz can handle
external streams properly.

* src/base/ftobjs.c (FT_Open_Face): Move code to set
FT_FACE_FLAG_EXTERNAL_STREAM to...
(open_face): This function.
* src/sfnt/ttload.c (tt_face_load_font_dir): Fix sign typos.
[autofit] Fix C++ compilation.

* src/autofit/afglobal.c (af_face_globals_get_metrics),
src/autofit/afdummy.c (af_dflt_script_class), src/autofit/afindic.c
(af_deva_script_class): Use proper casts.
[autofit] Fix `make multi' compilation.

* src/autofit/afblue.cin, src/autofit/afblue.c: Don't include
`afblue.h' but `aftypes.h'.
* src/autofit/afcjk.c: Don't include `aftypes.h' but `afglobal.h'.
[gzip] New function `FT_Gzip_Uncompress'.

This is modeled after zlib's `uncompress' function.  We need this
for WOFF support.

* include/freetype/ftgzip.h, src/gzip/ftgzip.c (FT_Gzip_Uncompress):
New function.

* src/gzip/rules.mk: Rewrite to better reflect dependencies.