Add Process::Status#description
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In the compiler we have a neat feature that shows a human readable description when a process process exited with an abnormal status.
This patch moves this as a gernal tool into stdlib as
Process::Status#description.The implementation is split into two parts:
Process::ExitReason#descriptionprovides the static description for most exit reasonsProcess::Status#descriptionenhances that description with details about the termination signal when it's a signal exit without further specification.