Add exchange field to RequiredObject.

tools.descartes.prisma.agent.generic.edit/plugin.properties

...agent/provider/GenericAgentConfigurationItemProvider.java

...gent/provider/GenericAgentItemProviderAdapterFactory.java

.../genericagent/provider/RequiredContainerItemProvider.java

...ric/genericagent/provider/RequiredObjectItemProvider.java

...s.descartes.prisma.agent.generic/model/genericagent.ecore

...rc/tools/descartes/prisma/agent/generic/GenericAgent.java

...risma/agent/generic/genericagent/GenericAgentFactory.java

...risma/agent/generic/genericagent/GenericAgentPackage.java

...tes/prisma/agent/generic/genericagent/RequiredObject.java

...nt/generic/genericagent/impl/GenericAgentFactoryImpl.java

...nt/generic/genericagent/impl/GenericAgentPackageImpl.java

...gent/generic/genericagent/impl/RequiredContainerImpl.java

...a/agent/generic/genericagent/impl/RequiredObjectImpl.java

...generic/genericagent/util/GenericAgentAdapterFactory.java

...a/agent/generic/genericagent/util/GenericAgentSwitch.java