https://github.com/wikimedia/wikipedia-ios/pull/4029 (Part 1 of 2)

Note for QA - here are areas that might have regressions:

• Loading spinner theming (Peek & pop views, article gallery, link editor, image editor, article history counts, article languages)
• Layout on onboarding/welcome screens (iPhone vs iPad)
• Status bar hiding
• Scroll indicator locations on list screens and article table of contents
• Article table of contents presentation
• Colors on popup banners (errors, no connection, etc.)
• Background app refreshing (not really sure how QA can test this, just listing for completion's sake)
• Points of interest are still hidden on map in Places
• Previous search terms on Places, confirm you can still swipe to delete and that deleting works.

Switching briefly to do notifications work on https://phabricator.wikimedia.org/T287298, will pick this back up after I make another PR there.

Part 2 progress branch is in T289535-2. I have removed all the warnings and reworked peek and pop to use the UIContextMenuConfiguration previewing. Remaining work is:

1. Add UIContextMenuActionProvider for all new UIContextMenuConfigurations I have made so far for any new areas previewing to articles, so we see "Read now", "Save for later", etc context menu options when peeking in these new spots. Can probably lean on previewActions property in ArticleViewControllerLinkPreviewing.swift, though we should also probably rework that property since UIPreviewAction is deprecated.
2. UI polish - I sometimes see flashes of the wrong background color depending on the theme when peeking.
3. Performance optimization - generally peeking felt slower elsewhere in the app than on the article, so maybe we can look into adding any pre-fetching like we do in the contextMenuConfigurationForLinkURL of ArticleContextMenuPresenting.swift).
4. Altogether this branch probably could use some code cleanup and maybe protocol extensions or the like to make this new stuff more DRY.

Part 2: https://github.com/wikimedia/wikipedia-ios/pull/4094

This will be available to test starting in the next TestFlight build (6.9.0 1884).

@ABorbaWMF given the difficulty in finding test devices we're going to take similator testing as sufficient, so you're off the hook for this one. Ideally we'd have you get a device eventually but I don't think the risk here is worth blocking you on it.