Revisit the use of informational footers in forms because:
- iOS uses Section footers
- macOS uses a secondary label below the main row label
Therefore:
- Add .themeRow() modifier to accomplish macOS behavior
- iOS: leave .themeSection() as is, and add a dummy .themeRow() that
does nothing
- macOS: make footer ineffective in .themeSection(), but add .themeRow()
modifiers to move footers to rows
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