Expose the hide and restore functionality

[Piralein]

Exposes the hide/restore functionality to the author of the asset.

Problems:

• Hidden assets are currently not linked anywhere for the owner or moderator. (unless I missed it)
• Hidden assets are still viewable with a direct link

Solution/Changes:

• [x] Expose the asset to authors ~~and moderators~~ if the user filter is used. (default My Assets link functionality)
• [x] Hidden assets can only be viewed by the author or a moderator, otherwise it will throw a not found error.
• [x] Restructured the asset view to be more clear
• [x] Add a author tools container in the same way as the admin tools container.

Hidden asset in my assets:

Asset view:

[coppolaemilio]

@Piralein is this PR still a draft? what are the steps needed to finish it up? Thanks :)

[Piralein]

I haven't tested the API side. It could have unexpected problems, because of the change to the query and login token validation. I can't remember what I considered as a problem specifically. The website part should be ready, but I need to re-test it.