feat: Add extensibility for tmtv and segmentation modes (#6128)

* feat: Add extensibility for tmtv and segmentation modes

* Fixes for ordering issues on laod

* Remove unnecessary reference lookup

* Chane side panel timing to fix tests

* PR comments - change how mode definitions get created

* Improvements to mode customizations

* Start organizing customizations

* Misc fixes for a customization demo page

* Security fixes

* PR requested changes to naming

platform/app/public/config/default.js

@@ -33,7 +33,7 @@ window.config = {
   // are never executed. Example (left disabled here on purpose):
   //
   // customizationUrlPrefixes: {
-  //   default: './customizations/',                       // ?customization=ctPresets
+  //   default: './customizations/',                       // ?customization=tools/ctPresets
   //   '/remote/': 'https://cdn.example.com/ohif-custom/', // ?customization=/remote/siteA
   // },
   // ----------------------------------------------------------------------------