Sets whether or not the unit can be selected by the player.

#Gets all units around core and freezes these 
CurrentCoords 18 GetUnitsInRange 0 do
	->unit
        <-unit FALSE SetUnitSelectableOverride 
loop

:awake
  #before anything else is done, freeze all units under this one, then destroy oneself
  CurrentCoords 0 TRUE GetAllUnitsInRange 0 do
    ->unit
    <-unit FALSE SetUnitSelectableOverride
  loop
  Self 0 Destroy