Add comments to slideshow

[oparoz]

Once comments are implemented in 9.0, we will be able to add them to the slideshow.

• Comments in core
• Files sidebar in slideshow Add Files sidebar to the slideshow #548 Design a custom sidebar Create custom detailsview for the slideshow #549
• Enable comments

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[oparoz]

Sidebar is a pre-requisite: #548

[oparoz]

#548 will probably never happen, so we can't get the whole commenting system "for free", but what we could do is maybe show comments read-only?
The main drawback is that the Gallery sidebar won't look and work the same as the one in Files, but this is expected since that has not been designed to be shared.

@jospoortvliet @jancborchardt

[oparoz]

This issue was moved to nextcloud/gallery#35