RawFilePath conversion of System.Directory

By using System.Directory.OsPath, which takes and returns OsString,
which is a ShortByteString. So, things like dirContents currently have the
overhead of copying that to a ByteString, but that should be less than
the overhead of using Strings which often in turn were converted to
RawFilePaths.

Added Utility.OsString and the OsString build flag. That flag is turned
on in the stack.yaml, and will be turned on automatically by cabal when
built with new enough libraries. The stack.yaml change is a bit ugly,
and that could be reverted for now if it causes any problems.

Note that Utility.OsString.toOsString on windows is avoiding only a
check of encoding that is documented as being unlikely to fail. I don't
think it can fail in git-annex; if it could, git-annex didn't contain
such an encoding check before, so at worst that should be a wash.

doc/todo/RawFilePath_conversion.mdwn

@@ -8,13 +8,6 @@ Some commands like `git-annex find` use RawFilePath end-to-end.
 But this conversion is not yet complete. This is a todo to keep track of the
 status.
 
-* The Abstract FilePath proposal (AFPP) has been implemented, and so a number of
-  libraries like directory now have versions that operate on
-  OSPath. That could be used in git-annex eg for things like
-  getDirectoryContents, when built against those versions.
-  (OSPath uses ShortByteString, while RawFilePath is ByteString, so
-  conversion still entails a copy, eg using 
-  `System.OsString.Internal.fromBytes`)
 * unix has modules that operate on RawFilePath but no OSPath versions yet.
   See https://github.com/haskell/unix/issues/240
 * filepath-1.4.100 implements support for OSPath. It is bundled with