True TRAMP Support

[OliverMead]

#1559 (and accompanying #1739) suppose that compilation may be done over TRAMP, however haskell-interaction-mode still appears to use a local ghci. (which, for example, the less feature-full run-haskell does not).
Use cases for interactive haskell development over TRAMP include:

• Development in a container (such as with tramp-nspawn or docker-tramp) without running emacs within the container.
• Development with more powerful (or specialized) hardware over ssh, without resorting to emacs -nw or X11 forwarding.

I understand that this should be considered a feature request, and it is something I will be looking into myself (although my skills with elisp are not advanced).