Object stuffing at spawn now working

-When an objectSpawner causes an object to spawn, if the object has a
spawnContainer set it will be stuffed inside the inventory of the spawn
container when it is created.

-Still need to set creating objects inside of inventories at room
creation.  This will be handled by the stuffList attribute of each room.

-Need to make invisible objects not alert to players in a room when they
are created.  Same goes with objects spawning in an inventory.
-Bug involved with the TIMERS list held by objectSpawners.  Objects seem
to spawn once, and then never execute again.