Merge haskell-ts-mode in upstream

[Pranshu Sharma]

Hello emacskin,

Around Augest, I asked for this first, but I still had do deal with the
FSF bureaucracy, but now that is done (and I have made a lot of changes
to the mode), I think it's ready.

I've attached a file.

The repo is here: https://hg.bauherren.ovh/haskell-ts-mode/ , but I've
attached the main file.

haskell-ts-mode.el
Description: haskell ts mode

-- 
Pranshu Sharma <https://p.bauherren.ovh>