Part of https://github.com/harfbuzz/harfbuzz/issues/1652

Part of https://github.com/harfbuzz/harfbuzz/issues/1652

UCDN was ~120kb of data.  New implementatoin is 69kb in default builds,
and 49kb if built with HB_OPTIMIZE_SIZE or __OPTIMIZE_SIZE__.  The
latter automatically enabled if built with -Os or -Oz.

There's room to shave off another 10kb or 20kb.  That will follow later.

Fixes https://github.com/harfbuzz/harfbuzz/issues/1652

Part of https://github.com/harfbuzz/harfbuzz/issues/1652

Part of https://github.com/harfbuzz/harfbuzz/issues/1652

Saves 4 or 8 bytes per object on 64bit archs.

I think I like the uniform "hb-*" more.

More useful.

It assumes all names are encoded in UTF16-BE.  Other than that, and not
listing languages correctly, it's *supposed* to work.

Fixes https://github.com/harfbuzz/harfbuzz/issues/1260

Part of https://github.com/harfbuzz/harfbuzz/issues/1159

.

Sorry for the noise, downstream custom builders.  Please adjust.

Finally, unified!

So we are not relying on version of Unicode data in glib...

Fixes https://github.com/behdad/harfbuzz/issues/386
Fixes https://github.com/behdad/harfbuzz/issues/388

Fixes https://github.com/behdad/harfbuzz/issues/103

https://bugs.freedesktop.org/show_bug.cgi?id=91228

Commit cdcdfe61 changed two `#pragma
message` to `#pragma error` in hb-unicode.cc, however MSVC uses #error,
just like the #else branch. `#pragma error` is an unknown pragma so
MSVC does not fail the build because of it, which I believe was the
intention of that commit.

If it's meant to be an #error, then the #ifdef for _MSC_VER can be
removed entirely.

Based on data from http://upstream-tracker.org/versions/harfbuzz.html
Resolves #103

Hopefully this results in fewer badly built HarfBuzz integrations.

Ouch!

Useful for Android / Chrome / etc when ICU is built in the same
library as harfbuzz itself.

Since our types are not associated with their methods, marking
constructors makes them inaccessible from bindings.  Undo for now.

https://github.com/grigorig/ucdn

It's considerably faster than the fallback implementation we had
previously!

Implemented for Arabic, Hebrew, and generic marks.
Activated if no GPOS table present.