[LMS-2029] limit number of initially loaded features; load subsequent features on demand

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

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

.../application/detailviewers/heatmaps/HeatmapPresenter.java

...ent/application/detailviewers/heatmaps/PlateLayouter.java

...pplication/detailviewers/heatmaps/PlateLayouterModel.java

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

...is/plugin/screening/server/FeatureCountLimitProvider.java

...s/plugin/screening/server/IFeatureCountLimitProvider.java

...gin/screening/server/IScreeningBusinessObjectFactory.java

...ugin/screening/server/ScreeningBusinessObjectFactory.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

...x/cisd/openbis/plugin/screening/shared/ResourceNames.java

...ening/shared/authorization/DatasetReferencePredicate.java

...ugin/screening/shared/basic/dto/FeatureVectorDataset.java

screening/source/java/screening-applicationContext.xml

screening/source/java/service.properties

...tion/detailviewers/heatmaps/WellTooltipGeneratorTest.java