Better nullability and error handling#315

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Commits on Sep 18, 2019

Add nullability annotation for functions that may return nil if there is an issue reading the input file.
Zev Eisenberg
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Use Obj-C generics.
Zev Eisenberg
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Use more accurate property annotation to silence static analysis warning.
Zev Eisenberg
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More idiomatic Objective-C error handling: treat error parameter as undefined unless result signals failure via a nil value.
Zev Eisenberg
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Fix copypasta.
Zev Eisenberg
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Fix typo.
Zev Eisenberg
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Add instructions to the release notes document.
Zev Eisenberg
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Update changelog.
Zev Eisenberg
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