Leverage AlsoUsableForAttribute for more interoperable typedefs #930
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Fixed #199
Fixed #924
Adds implicit conversion operators between AlsoUsableFor types. An existing example included in the tests is
BCRYPT_KEY_HANDLE->BCRYPT_HANDLE.When microsoft/win32metadata#1517 is fixed, this will also support
HMODULE <=> HINSTANCEconversions.