Add group chat functions, slight refactoring

src/structures/Base.js

@@ -0,0 +1,39 @@
+'use strict';
+
+/**
+ * Represents a WhatsApp data structure
+ */
+class Base {
+    constructor(client) {
+        /**
+         * The client that instantiated this
+         * @readonly
+         */
+        Object.defineProperty(this, 'client', { value: client });
+    }
+
+    _clone() {
+        return Object.assign(Object.create(this), this);
+      }
+    
+    _patch(data) { return data; }
+
+    /**
+     * Name that represents this model in the WhatsApp Web Store
+     * @readonly
+     */
+    static get WAppModel() {
+        return this.name;
+    }
+
+    /**
+     * Extra fields to add to model serialization 
+     * @readonly
+     */
+    static get extraFields() {
+        return [];
+    }
+
+}
+
+module.exports = Base;