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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

Closes #1867

PiperOrigin-RevId: 215392714

Comments changes, no functionality changes

merging 

This merges a Google-internal change (117235625).

Original CL description:
This CL was created manually in about an hour with sed, a Python script
to find all the places unqualified 'string' was mentioned, and some help
from Emacs to add the "std::" qualifications, plus a few manual tweaks.

works properly where return type is a reference.

Distinguish between C++11 language and library support for std::function, std::begin, std::end, and std::move in gtest and gmock.
Bring in gtest 694.

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

Allows mock methods overloaded on argument number or the const-ness of this object to appear on the same source line.