-------- KEYS --------
targetname: used to trigger this
message: entity field list
-target: when set, target_spawn edits entities, instead of creating new ones
+target: when set, target_spawn edits entities, instead of creating new ones; the special value *activator causes the activator to be edited
count: make sure no more than count entities have been created by this (refuse to spawn new ones if exceeded)
killtarget: reference entity (can be used as $killtarget)
target2: reference entity (can be used as $target2)