Listfile > gameobject for existing displayID

[Amaroth]

At the moment, listfile > gameobject workflow does not support following scenario:

• Model in listfile is found in DBC
• No displayID is generated, HOWEVER:
• gobject is generated in database (if it doesn't exist or if REPLACE is used), using already existing displayID

I'll implement this, not sure wheter in 2.0 or 2.1 though.