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Fixed #6031 - Redelivery of routing slips was not properly propagating the Result through the RetryContext
Fixed #4692 - OperationCanceledException was for some reason not showing up in GetBaseException(), so checking for both now.
Added IRoutingSlipBuilder, which is now registered in the container, so that a routing slip can be built and executed from the Abstractions assembly only.
Add the ability to delay execute of the next routing slip activity, as well as a new callback for setting variables, setting the delay.
Massive file cleanup
Fixed #4420 - consistent application of supported message types across Quartz/HangFire and Outbox
Added retry and more consistent support for the routing slip request proxy
Replace Array.Empty with collection expression