[IDC-1672] Highlight SEG segment/ RT structure when click to jump. (#2034)

* Highlight for RTSTRUCT.

* SEG temp crosshairs.

* Disable RT highlighting for now.

* Remove TODO

extensions/dicom-rt/src/tools/modules/rtStructModule.js

@@ -13,7 +13,8 @@ function refreshViewport() {
 
 const configuration = {
   lineWidth: 3,
-  opacity: 1.0,
+  opacity: 0.75,
+  highlightOpacity: 0.5,
 };
 
 const state = {