bug#55539: 28.1; Support for the Kharoṣṭhī Script

[Stefan Baums]

> we prefer not to have too many small files for the reasons of
> imposing a better organization on our sources

Do as you see fit. But if you integrate my input method into a
larger file, please do preserve the author note with my name and
email address. For obscure scripts like this, I think it is
important that users can easily contact the author in case of
questions or problems.