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😉 Flashlight: Add blink

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Original file line number	Diff line number	Diff line change
`@@ -46,6 +46,16 @@ extension Control.Flashlight {`
`46`	`46`	`}`
`47`	`47`	`}`
`48`	`48`
	`49`	`+ public static func blink(count: Int = 1, interval: TimeInterval = 0.1) {`
	`50`	`+ Task {`
	`51`	`+ for _ in 0..<count {`
	`52`	`+ toggle()`
	`53`	`+ try? await Task.sleep(nanoseconds: UInt64(1e+9 * interval))`
	`54`	`+ toggle()`
	`55`	`+ }`
	`56`	`+ }`
	`57`	`+ }`
	`58`	`+`
`49`	`59`	`private static var deviceWithFlashlight: AVCaptureDevice? {`
`50`	`60`	`guard`
`51`	`61`	`let device = AVCaptureDevice.default(for: .video),`

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