Getting the hang of how to cleanly use gtest.

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.

Use with --verbose to see what's failing

ICU fails for now.

Wraps around glib for convenience and ease of use.

Will be adding font_funcs subclassing instead.

Should be all set now.

Because the following loop overflows:

  while (size > new_allocated)
      new_allocated += (new_allocated >> 1) + 32;

With gcc on arm, request 8-bit structure alignment.

And hb-view --direction argument.

Now that we use C++ for all source code, lets benefit from it!

The hb_be_int16/32_get/put/eq() macros grow code size if replaced with
inline functions, so leave them as is.