设计新的插件框架
	修改：      ../doc/Client.pod
	修改：      ../lib/Webqq/Client.pm
	修改：      ../lib/Webqq/Client.pod
	删除：      ../lib/Webqq/Client/App/About.pm
	删除：      ../lib/Webqq/Client/App/SendMsgFromSocket.pm
	修改：      ../lib/Webqq/Client/Method/_login2.pm
	修改：      ../lib/Webqq/Client/Method/_send_group_message.pm
	修改：      ../lib/Webqq/Client/Method/_send_message.pm
	修改：      ../lib/Webqq/Client/Method/_send_sess_message.pm
	新文件：    ../lib/Webqq/Client/Plugin.pm
	新文件：    ../lib/Webqq/Client/Plugin/About.pm
	重命名：    ../lib/Webqq/Client/App/ClientStore.pm -> ../lib/Webqq/Client/Plugin/ClientStore.pm
	重命名：    ../lib/Webqq/Client/App/HelloGirl.pm -> ../lib/Webqq/Client/Plugin/HelloGirl.pm
	重命名：    ../lib/Webqq/Client/App/Msgstat.pm -> ../lib/Webqq/Client/Plugin/Msgstat.pm
	重命名：    ../lib/Webqq/Client/App/Perlcode.pm -> ../lib/Webqq/Client/Plugin/Perlcode.pm
	重命名：    ../lib/Webqq/Client/App/Perldoc.pm -> ../lib/Webqq/Client/Plugin/Perldoc.pm
	重命名：    ../lib/Webqq/Client/App/PostImgVerifycode.pm -> ../lib/Webqq/Client/Plugin/PostImgVerifycode.pm
	重命名：    ../lib/Webqq/Client/App/SendMsgControl.pm -> ../lib/Webqq/Client/Plugin/SendMsgControl.pm
	重命名：    ../lib/Webqq/Client/App/SendMsgFromMsg.pm -> ../lib/Webqq/Client/Plugin/SendMsgFromMsg.pm
	新文件：    ../lib/Webqq/Client/Plugin/SendMsgFromSocket.pm
	重命名：    ../lib/Webqq/Client/App/ShowMsg.pm -> ../lib/Webqq/Client/Plugin/ShowMsg.pm
	重命名：    ../lib/Webqq/Client/App/SmartReply.pm -> ../lib/Webqq/Client/Plugin/SmartReply.pm
	重命名：    ../lib/Webqq/Client/App/SmartReply2.pm -> ../lib/Webqq/Client/Plugin/SmartReply2.pm
	修改：      ../lib/Webqq/Message.pm