[tvOS] ListView + Grid Landscape Poster Padding

[JPKribs]

This is almost an exact copy/paste from iOS to tvOS. I added the Focus elements from the tvOS PosterButton to the LibraryRow elements in tvOS. Tested to work and the Cinematic Backdrop is unaffected.

While I was in here, I noticed that the landscape grid didn't have any item spacing, resulting in some overlap in grid + landscape. I added in spacing to mirror the grid + portrait.

Resolves: #687

tvOS Current Implementation

tvOS Implementation (1 Column, 2 Columns, 3 Columns)

tvOS Settings

Landscape Posters Padding Changes

[LePips]

I'm fine that this starts the work for list views but the libraries currently don't update when the view type changes. The logic on iOS PagingLibraryView is pretty complicated so when I take a deeper look at tvOS I'll get to that, as well as most likely refining some views/spacing.

[JPKribs]

I'm fine that this starts the work for list views but the libraries currently don't update when the view type changes.

Sounds good. I can look at that as well as part of this if you'd like? For now, I've just fixed the merge issues (and 1 missing label for Columns) but should otherwise be the same as prior. Let me know if there is anything else you'd like me to do on this!