WIP on integrating hlint using DAML approach

But getting a mismatch on ghc-lib vs GHC types for the call to hlint.

Closes haskell#32

Author: alanz

exe/Main.hs

@@ -55,6 +55,7 @@ import Development.IDE.Plugin.CodeAction  as CodeAction
 import Development.IDE.Plugin.Completions as Completions
 import Ide.Plugin.Example                 as Example
 import Ide.Plugin.Floskell                as Floskell
+import Ide.Plugin.Hlint                   as Hlint
 import Ide.Plugin.Ormolu                  as Ormolu
 
 -- ---------------------------------------------------------------------
@@ -69,6 +70,7 @@ idePlugins includeExample
     CodeAction.plugin <>
     formatterPlugins [("ormolu",   Ormolu.provider)
                      ,("floskell", Floskell.provider)] <>
+    Hlint.plugin <>
     if includeExample then Example.plugin else mempty
 
 -- ---------------------------------------------------------------------

haskell-language-server.cabal

@@ -30,6 +30,7 @@ library
       Ide.Cradle
       Ide.Plugin.Config
       Ide.Plugin.Example
+      Ide.Plugin.Hlint
       Ide.Plugin.Ormolu
       Ide.Plugin.Floskell
       Ide.Plugin.Formatter
@@ -57,7 +58,9 @@ library
     , gitrev
     , hashable
     , haskell-lsp == 0.20.*
+    , haskell-src-exts
     , hie-bios >= 0.4
+    , hlint >= 2.2.10
     , hslogger
     , optparse-simple
     , process