elm-review support

This plugin supports projects using elm-review. Discover or set the path to the elm-review command in IntelliJ's general "Elm Language settings".

See documentation of the tool and it's installation here https://github.com/jfmengels/elm-review

Known limitations, but planned

The proposed "fix" for each review-message is not yet shown. elm-review's option --watch is not yet supported.