Added Span<T> and Memory<T> support

[Crypt32]

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• Updated all methods and constructors that accepted Byte[] to accept ReadOnlySpan<Byte> or ReadOnlyMemory<Byte> (depending on need)
• Removed long ago obsoleted APIs
• Obsoleted most properties that returned Byte[]
• all methods that returned Byte[] have a GetAsMemory() complementary method which returns ReadOnlyMemory<Byte>
• updated xml-docs
• other improvements

This release may introduce compilation errors which are easy to address by choosing correct overload.