Remove Child Creation Extenders to OCL from GATC
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evsanchez
Due to dependences of the ATC language with OCL, the Child Creation Extenders mechanism automatically installed in GATC has been polluted with extensions upon OCL, which are undesired. Remove the unnecessary code from the <...>ItemProviderAdapterFactories and also the OCL-related icons in the icons folder.
Removed OCL-related icons