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-study-list/server/methods/getStudyMetadata.js

@@ -0,0 +1,23 @@
+Meteor.methods({
+    /**
+     * Retrieves Study metadata given a Study Instance UID
+     * This Meteor method is available from both the client and the server
+     */
+    GetStudyMetadata: function(studyInstanceUid) {
+        log.info('GetStudyMetadata(%s)', studyInstanceUid);
+
+        // Get the server data. This is user-defined in the config.json files or through servers
+        // configuration modal
+        const server = getCurrentServer();
+
+        if (!server) {
+            throw 'No properly configured server was available over DICOMWeb or DIMSE.';
+        }
+
+        if (server.type === 'dicomWeb') {
+            return Services.WADO.RetrieveMetadata(server, studyInstanceUid);
+        } else if (server.type === 'dimse') {
+            return Services.DIMSE.RetrieveMetadata(studyInstanceUid);
+        }
+    }
+});