2.7.0: Support for strings with null bytes

Added

• Support strings with null bytes as patterns and input throughout the library. Note this means strings with null bytes will no longer be truncated at the first null byte. Thanks to @manueljacob for reporting this bug.

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SHA256 checksums:

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d328b5286d83ae265e13b855da8e348a976f80f91b748045b52073a570577954  re2-2.7.0-arm-linux.gem
7d993f27a1afac4001c539a829e2af211ced62604930c90df32a307cf74cb4a4  re2-2.7.0-arm64-darwin.gem
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be9095c33e9628644fd876c1e6379cbd6a99a1c786d496e087491471f78d53fc  re2-2.7.0-x86_64-linux.gem
319d88d2a8ff32eba45286e58a8d49bd8b59167afa718946165b67fec2ea13dc  re2-2.7.0.gem