force using AES for cert algo

[tg123]

follow up for #1343

after reviewing with .net security team, RC2 is no longer recommend

.SetKeyAlgorithm(NistObjectIdentifiers.IdAes128Cbc, PkcsObjectIdentifiers.IdHmacWithSha1)

this PR also move Classic certutils to its own project for readability

[tg123]

cc @GrabYourPitchforks

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@@            Coverage Diff            @@
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[tg123]

/hold

3DES is deprecated either.
seeking for AES solution

[tg123]

/unhold

tested for AES in windows

[tg123]

link the how to use aes with bc
bcgit/bc-csharp#234

[brendandburns]

/lgtm
/approve

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