LMS-1920 minor refactoring: move DTO classes

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

...application/detailviewers/LogicalImageDatasetSection.java

...t/application/detailviewers/LogicalImageSeriesViewer.java

.../client/application/detailviewers/LogicalImageViewer.java

...eb/client/application/detailviewers/PlateStyleSetter.java

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

...ent/application/detailviewers/WellImageSampleSection.java

.../application/detailviewers/dto/LogicalImageReference.java

...nt/web/client/application/detailviewers/dto/WellData.java

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

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

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