New role introspection code

[Brian T. Rice]

Brian T. Rice wrote:

> Some methods (but not nearly enough) for looking into role objects are 
> provided in src/mobius/vm/interp/map.slate, namely rolesNamed:, 
> rolesAt:, rolesNamedAt:. I need to work on these more since there are 
> methods that will not show up in my initial revision, but these are 
> enough for you to inspect with right now. This library is also 
> bootstrapped in to the standard image, so you can try this "out of the 
> box".

One quick way to use these is to run (say):

(Root traits rolesAt: 0) collect: [| :role | role selector] into: Set 
newEmpty.

or variations on that (this works for each of the methods mentioned above).

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