Fix use-after-end-of-scope.

Let me know if this breaks anyone's anything.

https://bugs.freedesktop.org/show_bug.cgi?id=65544

The Myanmar shaper now respects the uniscribe-bug-compatibility
option too.

We are not using it for anything lse it seems.

Another static-initialization down.  One more to go.

Removes one more static-initialization.  A few more to go.

This changes all the HB_DIRECTION_* enum member values, but is
nicer, in preparation for making hb_segment_properties_t public.

This is the most convenient way to browse scripts.

Cross-checked with Mark Davis's spreadsheet at http://goo.gl/x9ilM

Can be -1 for NUL-terminated string.  This is useful for passing parts
of a larger string to a function without having to copy or modify the
string first.

Affected functions:

	hb_tag_t hb_tag_from_string()
	hb_direction_from_string()
	hb_language_from_string()
	hb_script_from_string()

We need this to set data on objects safely without worrying that some
other thread unsets it by setting it at the same time.

Where causing issues for people with MSVC.

The test/object test is passing again, instead of deadlocking.

It uses locale information to detect default language.  It's used by
hb_shape() whenever language is not set on the buffer.

Not sure how to properly test it in the test suite.  Tested by observing
that with DejaVu Sans we select the proper local glyph version for U+431
under Serbian locale.  See http://www.pango.org/ScriptGallery

Step version up to 0.5.0.

Also, fix to pass "make distcheck"

For now, by taking a global user_data mutex.

Note that the static variable has to be a global static, as gcc
implements local statics differently and that would require linking
to libstdc++, which we don't want.

The Win32 definitions for LONG, ULONG, etc conflicts with
hb-open-type.h.  Avoid that by making sure hb-object-private.h
and hb-open-type.h are not included in the same compilation unit.

Patch from Bradley Grainger.

Update to http://unicode.org/iso15924

Fixes some of the test failures in test-unicode with ICU.  Still
one more to fix before the test passes.

And hb-view --direction argument.

So we can liberally use the simple features of C++ that parts of the
codebase is already using.

Also optimizes the common-direction script lookup.

This simplifies the code, reduces static data, and makes the design
more extensible to future additions of new scripts.