let adaptable dependency and adaptable variable implement identifier

tools.descartes.dni.adaptation/model/DNIMM3AP.xcore

...src/tools/descartes/dni/dnimm3ap/AdaptableDependency.java

...n/src/tools/descartes/dni/dnimm3ap/AdaptableVariable.java

...tation/src/tools/descartes/dni/dnimm3ap/DNIAPPackage.java

.../descartes/dni/dnimm3ap/impl/AdaptableDependencyImpl.java

...ls/descartes/dni/dnimm3ap/impl/AdaptableVariableImpl.java

...c/tools/descartes/dni/dnimm3ap/impl/DNIAPPackageImpl.java

...ni/dnimm3ap/provider/AdaptableDependencyItemProvider.java

.../dni/dnimm3ap/provider/AdaptableVariableItemProvider.java

...on/src/tools/descartes/dni/dnimm3ap/util/DNIAPSwitch.java