Work on refactoring measurements out of Lesion Tracker package

- Removed AssociatedStudies Collection
- Measurement API is generated from configuration files
- Data exchange methods are defined in configuration

Packages/ohif-viewerbase/lib/toggleDialog.js

@@ -0,0 +1,6 @@
+toggleDialog = element => {
+    const $element = $(element);
+    const isClosed = $element.hasClass('dialog-open');
+    $element.toggleClass('dialog-closed', isClosed);
+    $element.toggleClass('dialog-open', !isClosed);
+};