Opened up most public methods to Objective-C#159

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+149-96

Commits on Feb 27, 2018

Exposed most public methods as @objc .
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Commits on Mar 28, 2018

Reverted some @objc public methods and made them private.
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Commits on Apr 3, 2018

Commits on Mar 26, 2019

Updated to Swift 5.
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