replace hardcoded tests with submodule to the official testsuit

src/Language/Wasm/Interpreter.hs

@@ -37,7 +37,6 @@ import Data.Word (Word8, Word16, Word32, Word64)
 import Data.Int (Int32, Int64)
 import Numeric.Natural (Natural)
 import qualified Control.Monad as Monad
-import Data.Monoid ((<>))
 import Data.Bits (
         Bits,
         (.|.),

src/Language/Wasm/Lexer.x

@@ -13,7 +13,6 @@ module Language.Wasm.Lexer (
 import qualified Data.ByteString.Lazy as LBS
 import qualified Data.Char as Char
 import qualified Data.ByteString.Lazy.UTF8 as LBSUtf8
-import Control.Applicative ((<$>))
 import Control.Monad (when)
 import Numeric.IEEE (infinity, nan)
 import Language.Wasm.FloatUtils (makeNaN, doubleToFloat)