[tex4ht] tex4ht with opentype fonts support

[Linas Stonys]

Hi,
we have  tex4ht which supports opentype fonts 
https://github.com/mingiss/tex4ht-vtex
and would like to add it to texlive. It depends on luafonts script (from 
xdvipsk  bundle https://github.com/vtex-soft/texlive.xdvipsk 
<https://github.com/vtex-soft/texlive.xdvipsk/tree/master/Master/texmf-dist/tex/luatex/luafonts>).
created glyph map files.
xdvipsk will be added to the next texlive version so we would like to 
add updated tex4ht as well.
There will be some updates on it and I wander how we should name it? 
xtex4ht?

Thanks, Linas