Tracking implementation of the WARNING and DEPRECATED pragma aspects of GHC proposal [#65](https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0065-type-infix.rst) "Require namespacing fixity declarations for type names and WARNING/DEPRECATED pragmas". - [x] Add syntax for `{-# WARNING type D "some message" #-}`, `{-# WARNING data D "some message" #-}` and similar syntax for the `DEPRECATED` pragma. Change `Renamer` so it will take namespace specifier into consideration. - [ ] Introduce a new warning that fires when a WARNING/DEPRECATED pragma refers to a type-level name without a specifier, and add this warning to `-Wcompat`.