Now default shaper is truly no-op.

Not exhaustively tested, but I think I got the intended logic
right.

The logic can perhaps be simplified.  Maybe we should disabled
normalization with this shaper.  Then again, for now focusing on
correctness.

I was under the impression that EXTRA_DISTs will happen regardless of
automake conditionals.  Apparently I was wrong.

They've been disabled for a while and no one cared.  We're past
the point to need them for testing, and if we ever need to
resurrect them again, well, they're in git graveyard somewhere.

Also enable bootstrapping without them.

Move it to new harfbuzz-gobject library.  Implement enums and
boxed types for object-types.  Still have to do boxed types for
value types.

Add deprecated alias for old name.

Makes documentation / introspection easier.

Initial setup of gtk-doc. Straight forward setup following the gtk-doc
instructions. Ignore some troublesome types in src/hb-gobject.h. To
build use "./autogen.sh --enable-gtk-doc" then "make". Docs are in
harfbuzz/docs/reference/html/index.html.

Currently it only works with ICU that has .pc files.  I'll
wait till someone complains before fixing it for icu-config
systems.

Using a ragel machine.

Using a ragel machine.

Handles Tai Tham, Cham, and New Tai Lue for now.

Myanmar failures down from 51% to 0.00204648%!

MYANMAR: 1123860 out of 1123883 tests passed. 23 failed (0.00204648%)

This reverts commit fab7a71f.

Conflicts:
	src/hb-ot-shape-complex-indic-machine.hh

Keeping that generated file in-tree causes problems with processes like
tinderbox  that automatically fetch and build harfbuzz.  It's harder to
bootstrap harfbuzz now (as was previously), but I'm willing to give this
another chance and see how it goes.

Bug 54948 - Undefined symbols: "operator delete(void*)" "operator
new(unsigned long)" "___cxa_pure_virtual"

Eventually this will become part of a yet-to-be-written hb-ot cmdline
tool.

API additions:

	hb_segment_properties_t
	HB_SEGMENT_PROPERTIES_DEFAULT
	hb_segment_properties_equal()
	hb_segment_properties_hash()

	hb_buffer_set_segment_properties()
	hb_buffer_get_segment_properties()

	hb_ot_layout_glyph_class_t

	hb_shape_plan_t
	hb_shape_plan_create()
	hb_shape_plan_create_cached()
	hb_shape_plan_get_empty()
	hb_shape_plan_reference()
	hb_shape_plan_destroy()
	hb_shape_plan_set_user_data()
	hb_shape_plan_get_user_data()
	hb_shape_plan_execute()

	hb_ot_shape_plan_collect_lookups()

API changes:

	Rename hb_ot_layout_feature_get_lookup_indexes() to
	hb_ot_layout_feature_get_lookups().

New header file:

	hb-shape-plan.h

And a bunch of prototyped but not implemented stuff.  Coming soon.
(Tests fail because of the prototypes right now.)

https://github.com/grigorig/ucdn

Also move UTF routines into a separate file, to be reused from shapers
that need it.