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and x64_windows_msvc

This makes it easier to use GTest in projects that build with the
-Wmissing-declarations warning. This fixes the warning in headers and
source files, though not GTest's own tests as it is rather noisy there.

Without the directive embedding googletest into third_party breaks
any //... target.

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

Slightly better names and cleaner tests.
Please review

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.