Fix memory leaks and integer mismatches identified by Clang static analyzer#14

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ZevEisenberg wants to merge 7 commits intokevingessner:masterfrom

ZevEisenberg:master

Commits on Aug 3, 2019

Remove garbage collection flag.
Zev Eisenberg
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Open in Xcode 10.3.
Zev Eisenberg
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Fix numeric conversion precision errors.
Zev Eisenberg
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Use modern Objective-C literal syntax.
Zev Eisenberg
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Fix superclass/subclass integer type mismatch.
Zev Eisenberg
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Prevent potential crash when attempting to assign a null pointer.
Zev Eisenberg
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Fix leaks identified by static analyzer.
Zev Eisenberg
committed