first round of scripting changes

Actually, the second (I had added <category: 'foo'>
last week
but I forgot to send the patch to the list).

This adds #shape:, #subclass: and #instanceVariableNames: to
Class.
These methods will be called when parsing the new syntax,
but may
also be useful for those who want to stick with
message-sending.

Unlike Mike's version of #subclass:, this one does not
eliminate
the instance variables of the class if it is already
defined.
That is, after this:

    Object subclass: #A!
    A instanceVariableNames: 'a'!
    Number subclass: #A!

class `A' will still have one instance variable named `a'.

Paolo

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