[DGD] kotaka: new feature: object catalog

[Raymond Jennings]

Taking inspiration from SkotOS's ID system, I implemented an object
catalgo that allows user definable names for objects that are much
friendlier than /path#number variants.

One enhancement above the skotos method is that object directories are
distributed across multiple objects, one object per directory.

This is to prevent the creation of a volatile centralized database
that would wreak havoc during swapping.

All relevant code is in the Catalog subsystem in the testmud section.