对聊天室外观和功能进行大改，添加使用表情包功能

WebRoot/chartroom/leave.jsp

@@ -1,5 +1,5 @@
-<%@ page contentType="text/html; charset=gb2312" language="java"%>
-<% request.setCharacterEncoding("gb2312"); %>
+<%@ page contentType="text/html; charset=utf-8" language="java"%>
+<% request.setCharacterEncoding("utf-8"); %>
 <%@ page import="java.util.Vector"%>
 <%@ page import="com.wgh.UserForm"%>
 <%