autosave 升级， 为避免其他代码的干扰， 新开了一个事件
删除新增的事件， 改为由background插件做修改
Merge remote-tracking branch 'upstream/dev-1.3.0' into dev-1.3.0
修改background插件绑定的事件
Merge remote-tracking branch 'upstream/dev-1.3.0' into dev-1.3.0
[test]
Merge branch 'dev-1.3.0' of https://github.com/HanCong03/ueditor into dev-1.3.0
[test]右键用例
autosave clear 没有用到,注释掉
Merge branch 'dev-1.3.0' of https://github.com/campaign/ueditor into dev-1.3.0
merge
[fix]by Jinqn修改seciton、background、music插件
[fix]by Jinqn修改music插件的插件