Added option to disable attachments and groups on both client and server

common/src/main/java/envoy/event/GroupCreationResult.java

@@ -0,0 +1,25 @@
+package envoy.event;
+
+/**
+ * Used to communicate with a client that his request to create a group might
+ * have been rejected as it might be disabled on his current server.
+ * <p>
+ * Project: <strong>common</strong><br>
+ * File: <strong>GroupCreationResult.java</strong><br>
+ * Created: <strong>22.08.2020</strong><br>
+ *
+ * @author Leon Hofmeister
+ * @since Envoy Common v0.2-beta
+ */
+public class GroupCreationResult extends Event<Boolean> {
+
+	private static final long serialVersionUID = 1L;
+
+	/**
+	 * Creates a new {@code GroupCreationResult}.
+	 *
+	 * @param success whether the GroupCreation sent before was successful
+	 * @since Envoy Common v0.2-beta
+	 */
+	public GroupCreationResult(boolean success) { super(success); }
+}

common/src/main/java/envoy/event/NoAttachments.java

@@ -0,0 +1,25 @@
+package envoy.event;
+
+/**
+ * This event is used so that the server can tell the client that attachments
+ * will be filtered out.
+ * <p>
+ * Project: <strong>common</strong><br>
+ * File: <strong>NoAttachments.java</strong><br>
+ * Created: <strong>22.08.2020</strong><br>
+ *
+ * @author Leon Hofmeister
+ * @since Envoy Common v0.2-beta
+ */
+public class NoAttachments extends Event<Void> {
+
+	private static final long serialVersionUID = 1L;
+
+	/**
+	 * Creates a new {@code NoAttachments}.
+	 *
+	 * @since Envoy Common v0.2-beta
+	 */
+	public NoAttachments() { super(null); }
+
+}