refactor: Move events to lib/src/omemo

lib/src/omemo/events.dart

@@ -0,0 +1,28 @@
+import 'package:omemo_dart/src/double_ratchet/double_ratchet.dart';
+import 'package:omemo_dart/src/omemo/device.dart';
+
+abstract class OmemoEvent {}
+
+/// Triggered when a ratchet has been modified
+class RatchetModifiedEvent extends OmemoEvent {
+
+  RatchetModifiedEvent(this.jid, this.deviceId, this.ratchet);
+  final String jid;
+  final int deviceId;
+  final OmemoDoubleRatchet ratchet;
+}
+
+/// Triggered when the device map has been modified
+class DeviceMapModifiedEvent extends OmemoEvent {
+
+  DeviceMapModifiedEvent(this.map);
+  final Map<String, List<int>> map;
+}
+
+/// Triggered by the OmemoSessionManager when our own device bundle was modified
+/// and thus should be republished.
+class DeviceModifiedEvent extends OmemoEvent {
+
+  DeviceModifiedEvent(this.device);
+  final Device device;
+}