Support for the Haskell programming language in visual studio code.

Adds highlighting support for Haskell (.hs and .lhs). This is a (now heavily) modified version of the syntax file from the Haskell TextMate bundle. Additionally there is support for Cabal files (.cabal) via a concoction of my own.

Also adds automatic indentation after where, do, -> etc. and surrounding brackets ([], {} etc)

If you happen to notice bugs or have suggestions for improvements visit the issue section of the repository.

Thanks to @Miguel-Fontes for enabling support for literate Haskell.