Add zoom slider to other grid views

[cj12312021]

This pull request brings the zoom slider to the movie, performer, and studio pages. It makes sense to save the state of the zoom index for each page, but to minimize conflicts, it probably makes sense to wait until #4453 is merged.

Closes #2201

[cj12312021]

Hmm, I was under the impression that the zoom level wasn't stored in saved filters, but that does not seem to be the case. I don't think anything else needs to be done here.

[WithoutPants]

I can see merit in a zoom slider for movie cards, but is there really a need for zooming of performer and studio cards?

[cj12312021]

I remember Echo specifically requested the zoom slider on the performer page so he could fit more of those cards on his screen https://discord.com/channels/559159668438728723/644934273459290145/1204623730895228989. Everything else was just for consistency.

[cj12312021]

Of the new additions, I’d probably only use the slider to reduce the size of the movie cards. I’m not against removing the slider on the studio page, but with the sliders on all the other pages, it seems like we might as well include it.

[Gykes]

Going to reference the FR here so that it's easier to track.

#2201

[cj12312021]

This branch is up to date with the latest changes in the development branch.