Change typedef to using

[StephanTLavavej]

Mechanically replaced (\w+) typedef (.+) (\w+); with using $3 $1 = $2;.

Long long ago, we replaced every occurrence of typedef in product code with using, as it's more readable and consistent (alias templates must be using). However, there were compiler bugs with using and attributes, so we didn't replace deprecated typedefs. Those compiler bugs were fixed long ago, and we've already accumulated a few occurrences of deprecated using, e.g.:

STL/stl/inc/type_traits

Lines 1097 to 1098 in 5aae678

	template <size_t _Len, size_t _Align = alignof(max_align_t)>
	using aligned_storage_t _CXX23_DEPRECATE_ALIGNED_STORAGE = _Aligned_storage_t<_Len, _Align>;

This finishes the overhaul for product code.

[StephanTLavavej]

I'm mirroring this to the MSVC-internal repo - please notify me if any further changes are pushed.