The driver calls epilog() in master after the master object has been
loaded. Mudlibs typically use epilog to initialize data structures in
master (such as security tables etc). epilog() should returns an array
of filenames which correspond to objects that the mudlib wants to have
preloaded; that is, loaded before the first player logs in. For each
filename returned in the array, the driver will called preload(file‐
name) in master.
The variable 'load_empty' is non-zero if the -e option was specified
when starting up the driver. It can be used as a signal to the mudlib
to not load castles, etc.