Add CanRender check for ContentCase, add opinionated ".ListItem"-rendering

[danielkestler]

No description provided.

[dimaip]

Hi @danielkestler, sorry I entirely missed this PR. What's the purpose of this new naming, I don't really get it?

[danielkestler]

Ouh, this is old ... well, at the time, I thought ListItem was a better naming for this. But maybe we should rethink this altogether. Feel free to throw my PR away.

[dimaip]

Yeah I'm overflown by notifications, sometimes it's just safer to ping me directly, especially if I'm not replying for a while... sorry about that!
As for the naming, I know my old name was quite bad, but this package is not really actively developed anymore and the whole concept of having it is rather obsolete, so I don't know if it makes much sense to cause more confusion by this API change... However if somebody is still using this package and prefers the new name I guess we could also merge it...