Add onGameTick20 to try and encourage lua to be a bit more efficient. Rewrite Space Invasion to use it. Top speed of aliens is 25% higher now, although that could be changed, I kinda liked it. Change parameter order of div().

{-# LANGUAGE OverloadedStrings #-}
module Consts where

import qualified Data.ByteString.Char8 as B

serverVersion :: B.ByteString
serverVersion = "1"