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Use BCL CipherMode enum for AesCipher class just like TripleDesCipher… #139

Job	Run time
Windows	12m 24s
Linux	8m 34s
Windows Integration Tests .NET	10m 59s
Windows Integration Tests .NET Framework	13m 45s
Publish NuGet Package	0s
Publish GitHub Package	0s
	45m 42s

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