Warp less ByteString Internal

A reworking of yesodweb/warp with less dependency on Data.ByteString.Internal

Warp is a server library for HTTP/1.x and HTTP/2 based WAI(Web Application Interface in Haskell). For more information, see Warp.

Changes :

Network/Wai/Handler/Warp/Buffer.hs :

1. copy :: Buffer -> ByteString -> IO Buffer
2. mallocBS :: Int -> IO ByteString
3. bufferIO :: Buffer -> Int -> (ByteString -> IO ()) -> IO ()

*4. withForeignBuffer :: ByteString -> ((Buffer, BufSize) -> IO Int) -> IO Int (left with dependence to Data.ByteString.Internal)

Network/Wai/Handler/Warp/PackInt.hs :

1. packIntegral :: Integral a => a -> ByteString
2. packStatus :: H.Status -> ByteString

Network/Wai/Handler/Warp/ResponseHeader.hs :

1. composeHeader :: H.HttpVersion -> H.Status -> H.ResponseHeaders -> IO ByteString
2. copyStatus :: H.HttpVersion -> H.Status -> ByteString
3. copyHeaders :: [H.Header] -> ByteString
4. copyHeader :: H.Header -> ByteString
5. copyCRLF :: ByteString -> ByteString

Network/Wai/Handler/Warp/RequestHeader.hs :

1. parseHeaderLines :: [ByteString] -> IO (H.Method ,ByteString -- Path ,ByteString -- Path, parsed ,ByteString -- Query ,H.HttpVersion ,H.RequestHeaders )
2. parseRequestLine :: ByteString -> IO (H.Method ,ByteString -- Path ,ByteString -- Query ,H.HttpVersion)