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more test changes

Add printer for std::nullptr_t, addressing https://github.com/google/googletest/issues/1616

Many code merge/upstream changes

code merge, cleanups

change static_cast to ImplicitCast_ for consitency
fixes for building with path names containing spaces

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.

Fixes the following errors:

hash_map(17): error C2338: <hash_map> is deprecated and will be REMOVED. Please use <unordered_map>. You can define _SILENCE_STDEXT_HASH_DEPRECATION_WARNINGS to acknowledge that you have received this warning. [googlemock\gtest\gtest-printers_test.vcxproj]
hash_set(17): error C2338: <hash_set> is deprecated and will be REMOVED. Please use <unordered_set>. You can define _SILENCE_STDEXT_HASH_DEPRECATION_WARNINGS to acknowledge that you have received this warning. [googlemock\gtest\gtest-printers_test.vcxproj]
googletest\test\gtest_catch_exceptions_test_.cc(152): error C2220: warning treated as error - no 'object' file generated
googletest\test\gtest_catch_exceptions_test_.cc(152): warning C4297: 'CxxExceptionInDestructorTest::~CxxExceptionInDestructorTest': function assumed not to throw an exception but does
  googletest\test\gtest_catch_exceptions_test_.cc(152): note: destructor or deallocator has a (possibly implicit) non-throwing exception specification

There were already some checks for _MSC_VER in the code, so this commit
continues in that vein.

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

char arrays are not escapped properly.