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-design/components/roundedButtonGroup/roundedButtonGroup.js

@@ -0,0 +1,40 @@
+Template.roundedButtonGroup.onCreated(() => {
+    const instance = Template.instance();
+    const reactiveValue = instance.data.value;
+
+    // Get the value for ReactiveVar or ReactiveDict objects
+    instance.getValue = () => {
+        return reactiveValue.get(instance.data.key);
+    };
+
+    // Set the value for ReactiveVar or ReactiveDict objects
+    instance.setValue = value => {
+        const args = [value];
+        if (reactiveValue instanceof ReactiveDict) {
+            args.unshift(instance.data.key);
+        }
+
+        reactiveValue.set(...args);
+    };
+
+    // Initialize the value with the first option if there's no value set and options are not toggleable
+    if (!instance.getValue() && !instance.data.toggleable) {
+        instance.setValue(instance.data.options[0].value);
+    }
+});
+
+Template.roundedButtonGroup.events({
+    'click [data-value]'(event, instance) {
+        event.preventDefault();
+        const $target = $(event.currentTarget);
+        const nullValue = $target.hasClass('active') && instance.data.toggleable;
+        const value = nullValue ? null : $target.attr('data-value');
+        instance.setValue(value);
+    }
+});
+
+Template.roundedButtonGroup.helpers({
+    getValue() {
+        return Template.instance().getValue();
+    }
+});