LMS-1491 screening API: fetching images, API improvements

screening/.classpath

screening/etc/service.properties

...sd/openbis/dss/generic/server/DssScreeningApiServlet.java

.../openbis/dss/screening/server/DssServiceRpcScreening.java

...bis/dss/screening/shared/api/IDssServiceRpcScreening.java

...creening/client/api/v1/ScreeningOpenbisServiceFacade.java

...cisd/openbis/plugin/screening/server/ScreeningServer.java

...penbis/plugin/screening/server/ScreeningServerLogger.java

...enbis/plugin/screening/server/logic/ScreeningApiImpl.java

...nbis/plugin/screening/shared/api/IScreeningApiServer.java

...red/api/authorization/ScreenerReadonlyPlatePredicate.java

...is/plugin/screening/shared/api/dto/DatasetIdentifier.java

...bis/plugin/screening/shared/api/dto/DatasetReference.java

...reening/shared/api/dto/FeatureVectorDatasetReference.java

...s/plugin/screening/shared/api/dto/IDatasetIdentifier.java

...ening/shared/api/dto/IFeatureVectorDatasetIdentifier.java

...gin/screening/shared/api/dto/IImageDatasetIdentifier.java

...bis/plugin/screening/shared/api/dto/IPlateIdentifier.java

...plugin/screening/shared/api/dto/ImageDatasetMetadata.java

...lugin/screening/shared/api/dto/ImageDatasetReference.java