Add an option to FriendlyOverloads to request previous pointer overloads

[jevansaks]

To make it easier to transition to Span overloads, this PR adds the option to opt in to pointer overloads. With this option things like DeviceIoControl will generate Span versions as well as pointer versions. And APIs like NtQueryObject which also have optional parameters will have 4 overloads (ones with and without optional parameters), e.g.:

NTSTATUS NtQueryObject(HANDLE Handle, OBJECT_INFORMATION_CLASS ObjectInformationClass, Span<byte> ObjectInformation, out uint ReturnLength)

NTSTATUS NtQueryObject(HANDLE Handle, OBJECT_INFORMATION_CLASS ObjectInformationClass, Span<byte> ObjectInformation)

NTSTATUS NtQueryObject(HANDLE Handle, OBJECT_INFORMATION_CLASS ObjectInformationClass, void* ObjectInformation, uint ObjectInformationLength, out uint ReturnLength)

NTSTATUS NtQueryObject(HANDLE Handle, OBJECT_INFORMATION_CLASS ObjectInformationClass, void* ObjectInformation, uint ObjectInformationLength)

Fixes #1519