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Now that googletest has moved to C++11, it should no longer
use NULL or 0 for the null pointer. This patch converts all
such usages to nullptr using clang-tidy.

This prevents LLVM from issuing -Wzero-as-null-pointer-constant
warnings.

PiperOrigin-RevId: 215814400

Comments changes, no functionality changes

Reduced template instantiation depth for the AllOf and AnyOf matchers. Also some formatting changes.

Implements .With() as a synonym of .WithArguments(); implements AllArgs(m) as a synonym of m; relies on gtest-port to #include tuple; fixes a compatibility with Symbian.