[OpenJDK 2D-Dev] RFR: 8143177: Integrate harfbuzz opentype layout engine per JEP 258

[Steven Loomis]

By the way - this patch fixes 
https://bugs.openjdk.java.net/browse/JDK-8050404 for example.
Syriac is supported in the JDK with this patch!

>>> big advance for complex scripts and also applies if you select 
>>> kerning or ligatures for Latin.
>>> However the latter is only detectable if the font implements support 
>>> for these.
>>> By "big advance" I mean that ICU has not been updated to recognise 
>>> recent opentype features.
>>> So harfbuzz should fix a number of things but unexpected changes 
>>> that look wrong
>>> should be reported so we can investigate.
>>>