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.

Assistant/Threads/TransferWatcher.hs

@@ -57,7 +57,7 @@ onErr = giveup
 
 {- Called when a new transfer information file is written. -}
 onAdd :: Handler
-onAdd file = case parseTransferFile file of
+onAdd file = case parseTransferFile (toRawFilePath file) of
 	Nothing -> noop
 	Just t -> go t =<< liftAnnex (checkTransfer t)
   where
@@ -73,7 +73,7 @@ onAdd file = case parseTransferFile file of
  - The only thing that should change in the transfer info is the
  - bytesComplete, so that's the only thing updated in the DaemonStatus. -}
 onModify :: Handler
-onModify file = case parseTransferFile file of
+onModify file = case parseTransferFile (toRawFilePath file) of
 	Nothing -> noop
 	Just t -> go t =<< liftIO (readTransferInfoFile Nothing file)
   where
@@ -88,7 +88,7 @@ watchesTransferSize = modifyTracked
 
 {- Called when a transfer information file is removed. -}
 onDel :: Handler
-onDel file = case parseTransferFile file of
+onDel file = case parseTransferFile (toRawFilePath file) of
 	Nothing -> noop
 	Just t -> do
 		debug [ "transfer finishing:", show t]