[epScript] Reduce overuse of DoActions in basic actions

[phu54321]

Copied from phu54321/epScript#5

function afterTriggerExec() {
  while(Bring(P1, AtLeast, 1, "Zerg Drone", "Anywhere")) {
    MoveLocation("loc", "Zerg Drone", P1, "Anywhere");
    RemoveUnitAt(1, "Zerg Drone", "loc", P1);
    CreateUnit(1, "Zerg Mutalisk", "loc", P1);
  }
}

/* __epspy__ makes 3 Triggers for 3 actions, 2 objects are wasted.
def afterTriggerExec():
  if EUDWhile()(Bring(P1, AtLeast, 1, "Zerg Drone", "Anywhere")):
    DoActions(MoveLocation("loc", "Zerg Drone", P1, "Anywhere"))
    DoActions(RemoveUnitAt(1, "Zerg Drone", "loc", P1))
    DoActions(CreateUnit(1, "Zerg Mutalisk", "loc", P1))
  EUDEndWhile()
*/

It should use 1 DoActions in a series of actions for performance and map file size.