Some optimisations to string splitting code.

Turns out that Data.List.Utils.split is slow and makes a lot of
allocations. Here's a much simpler single character splitter that behaves
the same (even in wacky corner cases) while running in half the time and
75% the allocations.

As well as being an optimisation, this helps move toward eliminating use of
missingh.

(Data.List.Split.splitOn is nearly as slow as Data.List.Utils.split and
allocates even more.)

I have not benchmarked the effect on git-annex, but would not be surprised
to see some parsing of eg, large streams from git commands run twice as
fast, and possibly in less memory.

This commit was sponsored by Boyd Stephen Smith Jr. on Patreon.

Utility/Rsync.hs

@@ -24,7 +24,7 @@ rsyncShell command = [Param "-e", Param $ unwords $ map escape (toCommand comman
 	{- rsync requires some weird, non-shell like quoting in
 	- here. A doubled single quote inside the single quoted
 	- string is a single quote. -}
-	escape s = "'" ++  intercalate "''" (split "'" s) ++ "'"
+	escape s = "'" ++  intercalate "''" (splitc '\'' s) ++ "'"
 
 {- Runs rsync in server mode to send a file. -}
 rsyncServerSend :: [CommandParam] -> FilePath -> IO Bool
@@ -123,7 +123,7 @@ parseRsyncProgress = go [] . reverse . progresschunks
 	{- Find chunks that each start with delim.
 	 - The first chunk doesn't start with it
 	 - (it's empty when delim is at the start of the string). -}
-	progresschunks = drop 1 . split [delim]
+	progresschunks = drop 1 . splitc delim
 	findbytesstart s = dropWhile isSpace s
 
 	parsebytes :: String -> Maybe Integer