Add new graphics, plague spitter summon, sounds

  *Remove attack bonus on injection spike so that attack values would be
  clearer
  *Fix sound on weapons
  *Added plague spitter summon, and new weapon which spreads disease like
  woundflame
  *Removed need not eat from Lodum general unit template. Added it back to
  appropriate units
  *Added mapmove 3 to undead units
  *Reduced spreaddom on gods, should have been 1, was 2