Image metadata lacks deepcache settings

[BurnZeZ]

It’s difficult to later reproduce images for lack of deepcache settings in the metadata.

I haven’t read webui code so maybe it hasn’t been done yet for a reason, but it will need to be done at some point so here’s the issue for it.

[aria1th]

I'll ping you when it is ready! (Currently I'm suffering with network issue, it should be done before christmas)