[Reflectivity] Object invalidate now works

Hi,

The mechanism that is behind the MetaLinks is now working for Object 50378:

Object methods do: #createTwin.
Object methods do: #invalidate.

This means we are very close on having that working on the whole image.

Next steps:

-> invalidate the whole kernel.
-> then: check/fix putting links on all methods (#before/#after).
        (there seems a bug in the code dealing with primitives, to check)
-> then: meta-recursion stopping links: take care of the code executed
             until the recursion check is reached. Test.
-> First use case: Breakpoints, with IDE integration.

        Marcus

Done. in 50384:

Object package methods do: [ :method |
        method createTwin. method invalidate].

        Marcus

As of 50#429, this is now working for the complete system… (silly bug in the end, like always…).

        Marcus