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ProcStats : Use mutex lock to make fetch() thread safe.

Christopher Rob Jones requested to merge jonrob/Gaudi:ProcStats-thread-safe into master

Whilst investigating a possible memory issue using the Memory Auditor, I discovered the information printed was garbled if multiple threads where used.

The issue was the ProcStats::fetch method which was not thread safe. This MR fixes that with a simple mutex lock.

I also did a drive-by cleanup and code modernisation.

FYI @clemenci

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