standardize arrow functions, use implicit types where applicable

src/Model/Chat/chatListModel.ts

@@ -15,7 +15,7 @@ export default class ChatListModel {
     connectionModel: ConnectionModel;
 
     // data
-    chatModels = new Set<ChatModel>();
+    chatModels: Set<ChatModel> = new Set<ChatModel>();
 
     // handlers
     messageHandler = (data: Message): void => {

src/Model/Chat/chatModel.ts

@@ -10,7 +10,6 @@ import {
     HandlerManager,
     createTimestamp,
     localeCompare,
-    parse,
     parseValidObject,
     stringify,
 } from "../Utility/utility";