Bump Xcode from 15.4 to 16.0

[uhooi]

References

Overall

• https://x.com/the_uhooi/status/1806761341061103857

• 233

Xcode 16

• https://developer.apple.com/documentation/xcode-release-notes/xcode-16-release-notes

Swift 6

View

• https://x.com/the_uhooi/status/1828987235632586810
• https://developer.apple.com/documentation/swiftui/view?changes=latest_minor

Retroactive

• https://x.com/stzn3/status/1803918835185246609
• https://forums.swift.org/t/accepted-se-0364-warning-for-retroactive-conformances-of-external-types/65015
• https://github.com/swiftlang/swift-evolution/blob/main/proposals/0364-retroactive-conformance-warning.md

count(where:)

• https://x.com/natpanferova/status/1819269134276088105
• https://nilcoalescing.com/blog/CountTheNumberOfObjectsThatPassATestInSwift/
• https://github.com/swiftlang/swift-evolution/blob/main/proposals/0220-count-where.md
• https://developer.apple.com/documentation/swift/int/words-swift.struct/count%28where%3A%29

EditorConfig

• https://editorconfig.org/
• https://github.com/pinterest/ktlint/blob/abb24b946cb2cc35037640dbb9b91850cd7c0070/.editorconfig
• https://github.com/rust-lang/rust/blob/6c3485512fc95fa9c43cb831607bfec9d2153b6e/.editorconfig