Pick one `std::(u)intX_t` vs `(u)intX_t`, `std::size_t` vs `size_t`, ptrdiff_t, etc, and update the sources to use that one form

[antkmsft]

Additionally, scan if we use NULL (in non-3rd party source) and update to nullptr.

[LarryOsterman]

For c++ code, I believe that the only "correct" version is the std::xxx version.

For correctness, the standard declares that the std::xxx type exactly matches the xxx type, so there is no generated code correctness issue associated with either selection.

However, to complicate this, we should absolutely allow putting a using namespace std; directive at the top of source files.

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