Restructured haskell/init-haskell-mode settings

[taksuyu]

Followed suggestions in #3488

[d12frosted]

How does it play when you change those variables in user-config function?

P. S. Sorry, can't test it right now - gonna play with it tomorrow 😄

[taksuyu]

So far I've tested with haskell-stylish-on-save; a simple (setq haskell-stylish-on-save t) within dotspacemacs/config works, and describe-variable properly reports that the variable is set to t and the default is nil when in haskell-mode.

When it was in :config trying to change haskell-stylish-on-save through emacs customization or dotspacemacs/config made no difference, unless I reloaded my spacemacs config while already in haskell-mode.

[d12frosted]

Great. Played with it a bit - works like a charm.

@syl20bnr thanks for this idea! Much easier to change configs.

[taksuyu]

Looks like there is some other stuff that got pushed, want me to bring the branch up to date?

[d12frosted]

@TheBB any chances that it gets merged?

[StreakyCobra]

This PR should probably be rebased to have more chances being merged. Then try to ping TheBB 😉

[taksuyu]

@TheBB Branch has been rebased to match with develop.

[TheBB]

Looks good. Labeling this so I don't forget.

[TheBB]

I didn't have to remember for long.

Thanks! Cherry-picked in develop. You can safely delete your branch.