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Add NullAway for more extensive static analysis

NullAway is an addition to ErrorProne to perform a more robust data
flow analysis for possible NPEs. This inferrence requires richer usage
of the defacto null checking annotations by defaulting to a non-null
expectation.

Due to limitations in the data flow, there are false positives which
requires slightly more verbose code or suppression. When possible,
the suppressions are isolated to individual statements to minimize
their scope.

89 of 89 new or added lines in 16 files covered. (100.0%)

5734 of 6097 relevant lines covered (94.05%)

0.94 hits per line