This provides a number of fixes, including better Arabic script support.

Tashkeel, diacritics that can be placed above and below letters to show vowels and more, are now much better supported, and languages other than Arabic should display correctly in most cases.

That said, there seem to be issues with certain combinations of tashkeel, where they don't display as I would expect them to based on how they're typed.  I'll continue to look into this, but it's a bit confusing because some fonts seem to display things differently as well.

Moving forward, the plan is still to round out CJK support, and supporting more South and South Eastern languages.