Add DVD, DVD menu support with libdvdcss, libdvdnav, libdvdread

[ghost]

There is no support (playback and DVD menu) in Deepin Movie for encrypted DVD and DVD folders.

These things are missing libdvdcss, libdvdnav, libdvdread.

Can you add the support?

There is no wonderful movie player on Linux that has these features.

[jhkyy]

I understand that libdvdcss has copyright issues，https://tech.qq.com/a/20130303/000043.htm。

[ghost]

@jhkyy
libdvdcss is just a library and is licensed under GPL v2. You can integrate it, but by default you can leave it disabled and if users want to enable it they have to manually enable it in Deepin Movie settings (libdvdcss (on/off).

It should work out of the box.

[meiyixiang]

Problems have been fed back to the product and have been adopted to schedule implementation