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Due to confusion arisen from "iff" standing for "if and only if",
this commit uses the latter.

Remove the #ifs for old, unsupported and buggy compilers:
* old versions of GCC & MSVC
* Symbian

PiperOrigin-RevId: 227116941

Applied fixes for ClangTidy modernize-use-override and modernize-use-using.

PiperOrigin-RevId: 223800219

Comments changes, no functionality changes

merging, 

...merging

merges-2

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.

Renames internal enums to the kFoo naming style.

Fixes gmock doctor to work with newer versions of Clang.

Publishes GTEST_HAS_STREAM_REDIRECTION (by Vlad Losev); casts char to unsigned char before calling isspace() etc to avoid undefined behavior (by Zhanyong Wan); fixes the VC projects (by Fredrik Roubert).

Adds threading support (by Vlad Losev); updates the version number (by Zhanyong Wan); adds release notes for 1.5.0 (by Vlad Losev).

Removes duplicated definition of SetArgumentPointee (by Vlad Losev); Makes gmock compilable on platforms that don't have ::abort() (by Acadeli Checa); Fixes compatibility with Symbian's STLport (by Acadeli Checa).

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.

Made the universal value printer safer when printing char[];
Removed duplicated code in InvokeWith;
Improved gmock_doctor.py.