Bring changes from office over

[ryknuth]

This brings over changes Office needs to build so we can more easily migrate changes in the future.

1. Comment out a bunch of unreferenced parameters.
2. Explicitly cast in comparisons
3. A few optimizations
4. Some SAL annotations
5. Remove typedef from enums. Specify default storage type for enums.
6. Remove problmatic unused ZipObject and ZipObjectWriter ctors
7. Remove u8 from char* definitions. This is incompatible with C++20 which would need to us char8_t*
8. Use localtime_s over localtime. This ctor doesn't set m_localTime so I'm not sure if this even matters.
9. Use LONG instead of long. These have different types on cross platforms