Expose the swift Snapshot class to Objective-C (#11291)
Expose the swift Snapshot class to Objective-C (#11291)

Explicitly annotate the Snapshot class with `@objcMembers` since Swift 3 `@objc` inference is deprecated in Swift 4.

This is required for Objective-C developers to be able to use [Snapshot snapshot:@"Screenshot" timeWaitingForIdle:20];

It is not required to add `@objcMembers` in the SnapshotHelperXcode8Version.swift file since Xcode < 9 does not support Swift 4.
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