Switch s3 to use only AWS Signature Version 4 #2
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While s3 states it supports AWS Signature Version 2 this is not the case as it requires custom changes such as Expires parameter, so the previous change which uses the common AWS Signature Version 2 caused failures.
Follow the official AWS SDK in using only Signature Version 4, which is now supported everywhere, to avoid using the old custom s3 Signature Version 2 implementation.
Also expose the option to enable debugging by switching const debug to var Debug.