closes #18: actor data now behind private symbol

scripts/engine.cm

@@ -1,8 +1,7 @@
 (function engine() {  
 globalThis.cell = prosperon
 cell.DOC = Symbol()
-var ACTORDATA = cell.hidden.ACTORSYM
-ACTORDATA = '__ACTORDATA__' // TODO: implement the actual actorsym
+var ACTORDATA = cell.hidden.actorsym
 var SYSYM = '__SYSTEM__'
 
 var ENETSERVICE = 0.1
@@ -112,7 +111,6 @@ function disrupt(err)
 actor_mod.on_exception(disrupt)
 
 var js = use_embed('js')
-
 var io = use_embed('io')
 
 if (!io.exists('.cell')) {
@@ -596,7 +594,7 @@ function actor_send(actor, message) {
     }
     return
   }
-  log.system(`Unable to send message to actor ${json.encode(actor)}`)
+  log.system(`Unable to send message to actor ${json.encode(actor[ACTORDATA])}`)
 }
 
 // Holds all messages queued during the current turn.