Summary of updates

Updated support Delphi XE to Delphi X10.2
Tested support for Windows 32/64Bit, MacOSX 32Bit
New TAmazonIndyRESTClient and TAmazonDelphiRESTClient classes
Updated TAmazonSignatureV4 class to be less reliant on Indy, Allowing for cross-platform
THashSHA2 supported in unit Amazon.Utils for Delphi XE8 and up.

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