Display Sha256 hash

[Zweibach]

Display the Sha256 hash somewhere easily copyable to look up in the client with. Some images might be a bit dubious but looking them up in Hydrus for the full set of tags and associated URLs could provide further context to clear up confusion.

[cinnamon-rolls]

This should be in the main branch as of the most recent push, let me know if its satisfactory and if so I'll close this out