To backport Net5 X509ChainTrustMode.CustomRootTrust feature to Net472 the intent is to allow users to create X509Chain and build with a custom root Use case: Azure app services

namespace find replace using find replace move linked files to project directory exclude from project unused code Work around lesser span support .CloneByteArray() -> .Clone() + cast Similar to Net5 CloneByteArray source code ToArray since string constructor doesn't yet support spans refactor C# 8.0 features such as remove all nullable reference code (find replace ? and !) inverse switch inline static functions

ToLpstrArray code inlined from Net5 source and use MemoryMarshal.GetReference in place of GetNonNullRef

Can't exclude x509certificate2, need to access internal member pal proj only includes windows Pal code

Need Net472 for SafeNCryptKeyHandle Maybe we can go further and grab it's source but this will do for now

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