Updates for VWF script replication changes

Update for changes in https://github.com/virtual-world-framework/vwf/pull/329.

@eric79, can you review?

Maybe the second, third, and final paramters can be written in the form:

    The second parameter (optional) defaults....

For the third parameter, I might be even more direct than saying it *affects* `this`.  I might say:

    The third parameter (optional) will be used as the `this` value for....