convert TopFilePath to use RawFilePath

Adds a dependency on filepath-bytestring, an as yet unreleased fork of
filepath that operates on RawFilePath.

Git.Repo also changed to use RawFilePath for the path to the repo.

This does eliminate some RawFilePath -> FilePath -> RawFilePath
conversions. And filepath-bytestring's </> is probably faster.
But I don't expect a major performance improvement from this.
This is mostly groundwork for making Annex.Location use RawFilePath,
which will allow for a conversion-free pipleline.

CmdLine/Batch.hs

@@ -102,7 +102,8 @@ batchFilesMatching :: BatchFormat -> (FilePath -> CommandStart) -> Annex ()
 batchFilesMatching fmt a = do
 	matcher <- getMatcher
 	batchStart fmt $ \f ->
-		ifM (matcher $ MatchingFile $ FileInfo f f)
+		let f' = toRawFilePath f
+		in ifM (matcher $ MatchingFile $ FileInfo f' f')
 			( a f
 			, return Nothing
 			)

CmdLine/Seek.hs

@@ -94,8 +94,8 @@ withPathContents a params = do
 		, return [(p, takeFileName p)]
 		)
 	checkmatch matcher (f, relf) = matcher $ MatchingFile $ FileInfo
-		{ currFile = f
-		, matchFile = relf
+		{ currFile = toRawFilePath f
+		, matchFile = toRawFilePath relf
 		}
 
 withWords :: ([String] -> CommandSeek) -> CmdParams -> CommandSeek
@@ -170,7 +170,7 @@ withKeyOptions ko auto keyaction = withKeyOptions' ko auto mkkeyaction
 		return $ \v@(k, ai) ->
 			let i = case ai of
 				ActionItemBranchFilePath (BranchFilePath _ topf) _ ->
-					MatchingKey k (AssociatedFile $ Just $ toRawFilePath $ getTopFilePath topf)
+					MatchingKey k (AssociatedFile $ Just $ getTopFilePath topf)
 				_ -> MatchingKey k (AssociatedFile Nothing)
 			in whenM (matcher i) $
 				keyaction v
@@ -232,8 +232,7 @@ prepFiltered a fs = do
 	map (process matcher) <$> fs
   where
 	process matcher f =
-		let f' = fromRawFilePath f
-		in whenM (matcher $ MatchingFile $ FileInfo f' f') $ a f
+		whenM (matcher $ MatchingFile $ FileInfo f f) $ a f
 
 seekActions :: Annex [CommandSeek] -> Annex ()
 seekActions gen = sequence_ =<< gen