30249
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11047 Integrate new class builder step 2
https://pharo.fogbugz.com/f/cases/11047
Diff information:
http://smalltalkhub.com/mc/Pharo/Pharo30/main/System-Support-MarcusDenker.869.diff
http://smalltalkhub.com/mc/Pharo/Pharo30/main/SlotTests-MarcusDenker.37.diff