Added Hyuga installer

[sakuraiyuta]

This PR adds Hy Language Server for Hy 0.24.0.

https://github.com/sakuraiyuta/hyuga

[mattn]

Thanks your contribution. Why don't you use pip_install.cmd ? Could you please explain why --system-site-package is required?

[sakuraiyuta]

@mattn Thank you for reply.

Could you please explain why --system-site-package is required?

Hyuga supports to search system installed packages. This feature needs to use --system-site-package.
In my opinion, some python developer want to use them.
(Yes, it's so dirty...but a way for users can dare to select.)

It seems no methods to pass through option arguments to pip_install.{sh,cmd}, so I avoided to use pip_install script.
Any ideas? Or should drop it?

Other way: Add options to lsp settings in initialize, e.g. additional-path: {system installed packages dir} like root-uri.

[mattn]

Thanks. So could you please update README Local Install to No? (If my understainding is right)

[mattn]

Now ready to merge this?

[sakuraiyuta]

Sorry for waiting you...ready now!

[mattn]

Thank you!!