====== emitzone ======

Creates a certain amount of creeper (or anticreeper) per frame until a predetermined total has been emitted, then causes its unit to self-destruct. Used by an invisible unit created upon impact by phantoms.

__**Arguments**__

  ?creeper (float)
  :Total amount of creeper to emit; shortly after this much has been emitted, the unit will die
  ?maxperframe (float)
  :Amount of creeper to emit per frame