[IDC-1670] Better display of derived datasets in side panel. (#1962)

* WIP

* WIP

* WIP

* WIP

* Working click on seg.

* Load SEG if not loaded and set active.

* RTSTRUCT

* feat: 🎸 Display SEG and RTSTRUCT in side panel

* Throw error if dataset not available.

* Add delay in microscopy viewer e2e test.

* Add delay in microscopy viewer e2e test.

extensions/dicom-rt/src/OHIFDicomRTStructSopClassHandler.js

@@ -1,5 +1,6 @@
 import { MODULE_TYPES, utils, DICOMWeb } from '@ohif/core';
 import loadRTStruct from './loadRTStruct';
+import getSourceDisplaySet from './getSourceDisplaySet';
 
 import id from './id';
 
@@ -67,6 +68,10 @@ const OHIFDicomRTStructSopClassHandler = {
       }
     }
 
+    rtStructDisplaySet.getSourceDisplaySet = function(studies) {
+      return getSourceDisplaySet(studies, rtStructDisplaySet);
+    };
+
     rtStructDisplaySet.load = function(referencedDisplaySet, studies) {
       return loadRTStruct(
         rtStructDisplaySet,