Add missing _binobj var for generators

[TiviPlus]

Similar to the database binobj, is a internal object

var/generator/gen = generator("circle", 0, 16, NORMAL_RAND)
world.log << "[gen._binobj]"

Welcome BYOND! (5.0 Public Version 514.1580)
generator("circle", 0, 16, NORMAL_RAND)

[SpaceManiac]

No problem merging this, but if I may ask, what is this _binobj actually useful for?

[TiviPlus]

In my specific case I'm using the string representation of the binobj in order to read the generators arguments, since you can't otherwise