macOS: Allow users to select Continuity Camera

[shiena]

fixed godotengine/godot-proposals#12125
Added Continuity Camera to the device discovery session to provide users with more camera options. Users on macOS 13+ can now select their Continuity Camera device within the application.
https://support.apple.com/en-us/102546

[Calinou]

Code looks good to me, but I don't have an iOS device to test this.

[bruvzg]

Looks fine, but I do not have anything to test it with.

Since you are changing this code, it probably worth replacing __MAC_OS_X_VERSION_MIN_REQUIRED (which only suppresses warnings) with runtime checks:

	NSArray<AVCaptureDevice *> *devices = nullptr;
#if defined(__x86_64__)
	if (@available(macOS 10.15, *)) {
#endif
		AVCaptureDeviceDiscoverySession *session;
		if (@available(macOS 14.0, *)) {
			session = [AVCaptureDeviceDiscoverySession discoverySessionWithDeviceTypes:[NSArray arrayWithObjects:AVCaptureDeviceTypeExternal, AVCaptureDeviceTypeBuiltInWideAngleCamera, AVCaptureDeviceTypeContinuityCamera, nil] mediaType:AVMediaTypeVideo position:AVCaptureDevicePositionUnspecified];
		} else {
			session = [AVCaptureDeviceDiscoverySession discoverySessionWithDeviceTypes:[NSArray arrayWithObjects:AVCaptureDeviceTypeExternalUnknown, AVCaptureDeviceTypeBuiltInWideAngleCamera, nil] mediaType:AVMediaTypeVideo position:AVCaptureDevicePositionUnspecified];
		}
		devices = session.devices;
#if defined(__x86_64__)
	} else {
		devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
	}
#endif

[RubenGarcia]

I´m also interested in this feature.

[Repiteo]

Thanks! Congratulations on your first merged contribution! 🎉