feat: 🎸 Upgrade to ConerstoneTools 4.0

Upgrade to CornerstoneTools 4.0. This will break things for users still
using 3.X.

BREAKING CHANGE: n

Author: JamesAPetts

example/package.json

@@ -6,7 +6,7 @@
   "dependencies": {
     "cornerstone-core": "2.2.8",
     "cornerstone-math": "0.1.8",
-    "cornerstone-tools": "3.16.0",
+    "cornerstone-tools": "^4.0.6",
     "cornerstone-wado-image-loader": "2.2.3",
     "dicom-parser": "1.8.3",
     "hammerjs": "^2.0.8",