Merged LesionTracker and OHIF Viewer, refactored out common components

Packages/viewerbase/lib/isTouchDevice.js

@@ -0,0 +1,5 @@
+isTouchDevice = function() {
+    return (('ontouchstart' in window)  ||
+        (navigator.MaxTouchPoints > 0) ||
+        (navigator.msMaxTouchPoints > 0));
+};