XYZTech issues

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                                            XYZTech

I just want to create section2 like section1 can unfold the cell but it crashed . I don't know why.

![2017-11-10 10 33 03](https://user-images.githubusercontent.com/10484324/32640300-001c7cf0-c603-11e7-8756-d6db1ce02ec7.png) ![2017-11-10 10 34 31](https://user-images.githubusercontent.com/10484324/32640301-00681516-c603-11e7-9077-1a4e2608810e.png) ![2017-11-10 10 34 38](https://user-images.githubusercontent.com/10484324/32640302-009a5ba2-c603-11e7-885e-d301830b73ef.png)

Dear author, does it support swift4.2?

Could we support AVI. WMV. MPG. RMVB. MKV. Flv. 3GP. MPG. MPEG ?

Add simple option for livephoto?

单独选择livephoto可否，有开发需求，感谢大神

<org.salient.artplayer.ui.VideoView. <org.salient.artplayer.VideoView

**Describe the bug** A clear and concise description of what the bug is. **To Reproduce** Steps to reproduce the behavior: 1. Go to '...' 2. Click on '....' 3. Scroll...