Reorganize module namespace

- Remove Language.Haskell prefix from all modules
- Move 'GHCMod.*' to 'GhcMod.Exe'
- Move 'GhcModExe' to 'GhcMod.Exe'

GhcMod/Exe/Internal.hs

@@ -0,0 +1,73 @@
+-- | Low level access to the ghc-mod library.
+
+module GhcMod.Exe.Internal (
+  -- * Types
+    GHCOption
+  , IncludeDir
+  , GmlT(..)
+  , MonadIO(..)
+  , GmEnv(..)
+  -- * Various Paths
+  , ghcLibDir
+  , ghcModExecutable
+  -- * Logging
+  , withLogger
+  , setNoWarningFlags
+  , setAllWarningFlags
+  -- * Environment, state and logging
+  , GhcModEnv(..)
+  , GhcModState
+  , GhcModLog
+  , GmLog(..)
+  , GmLogLevel(..)
+  , gmSetLogLevel
+  -- * Monad utilities
+  , runGhcModT'
+  , hoistGhcModT
+  , runGmlT
+  , runGmlT'
+  , gmlGetSession
+  , gmlSetSession
+  , loadTargets
+  , cabalResolvedComponents
+  -- ** Accessing 'GhcModEnv' and 'GhcModState'
+  , options
+  , cradle
+  , targetGhcOptions
+  , withOptions
+  -- * 'GhcModError'
+  , gmeDoc
+  -- * World
+  , World
+  , getCurrentWorld
+  , didWorldChange
+  -- * Cabal Helper
+  , ModulePath(..)
+  , GmComponent(..)
+  , GmComponentType(..)
+  , GmModuleGraph(..)
+  , prepareCabalHelper
+  -- * Misc stuff
+  , GHandler(..)
+  , gcatches
+  -- * FileMapping
+  , module GhcMod.FileMapping
+  ) where
+
+import GHC.Paths (libdir)
+
+import GhcMod.Target
+import GhcMod.DynFlags
+import GhcMod.Error
+import GhcMod.Logger
+import GhcMod.Logging
+import GhcMod.Monad
+import GhcMod.Types
+import GhcMod.Utils
+import GhcMod.World
+import GhcMod.CabalHelper
+import GhcMod.FileMapping
+
+-- | Obtaining the directory for ghc system libraries.
+ghcLibDir :: FilePath
+ghcLibDir = libdir