Merge branch 'tmf-674-feature' into 'develop'

src/main/java/org/etsi/osl/tmf/gsm674/model/Addressable.java

src/main/java/org/etsi/osl/tmf/gsm674/model/BaseEvent.java

...in/java/org/etsi/osl/tmf/gsm674/model/CalendarPeriod.java

src/main/java/org/etsi/osl/tmf/gsm674/model/Entity.java

src/main/java/org/etsi/osl/tmf/gsm674/model/EntityRef.java

src/main/java/org/etsi/osl/tmf/gsm674/model/Error.java

...java/org/etsi/osl/tmf/gsm674/model/EventSubscription.java

...org/etsi/osl/tmf/gsm674/model/EventSubscriptionInput.java

src/main/java/org/etsi/osl/tmf/gsm674/model/Extensible.java

...ava/org/etsi/osl/tmf/gsm674/model/ExternalIdentifier.java

...org/etsi/osl/tmf/gsm674/model/GeographicAddressValue.java

...in/java/org/etsi/osl/tmf/gsm674/model/GeographicSite.java

...gsm674/model/GeographicSiteAttributeValueChangeEvent.java

...a/org/etsi/osl/tmf/gsm674/model/GeographicSiteCreate.java

.../etsi/osl/tmf/gsm674/model/GeographicSiteCreateEvent.java

.../etsi/osl/tmf/gsm674/model/GeographicSiteDeleteEvent.java

...etsi/osl/tmf/gsm674/model/GeographicSiteEventPayload.java

...etsi/osl/tmf/gsm674/model/GeographicSiteRelationship.java

.../osl/tmf/gsm674/model/GeographicSiteStateChangeEvent.java

...a/org/etsi/osl/tmf/gsm674/model/GeographicSiteUpdate.java