OHIF-190 - Rehydrate PR (#1835)

* WIP rehydration.

* WIP OHIF-190 rehydrate.

* Remove debugger statements.

* Merge in and fix after OHIF-197 and OHIF-198

* Remove console.log

* Fix typo

* fix length tracking bug

* Respond to reviewer comments.

extensions/cornerstone/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@ohif/extension-cornerstone",
-  "version": "2.7.3",
+  "version": "3.0.0",
   "description": "OHIF extension for Cornerstone",
   "author": "OHIF",
   "license": "MIT",