LMS-1645 minor refactoring: ImageChannelStachReference -> WellImageChannelStack

.../screening/client/web/client/IScreeningClientService.java

...ening/client/web/client/IScreeningClientServiceAsync.java

...t/web/client/application/detailviewers/ImageUrlUtils.java

...ient/application/detailviewers/PlateMaterialReviewer.java

...b/client/application/detailviewers/WellContentDialog.java

...pplication/detailviewers/WellContentTimepointsViewer.java

...n/screening/client/web/server/ScreeningClientService.java

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

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

...bis/plugin/screening/server/logic/PlateContentLoader.java

...isd/openbis/plugin/screening/shared/IScreeningServer.java

...gin/screening/shared/basic/dto/WellImageChannelStack.java

...bis/plugin/screening/shared/imaging/HCSDatasetLoader.java

...is/plugin/screening/shared/imaging/IHCSDatasetLoader.java