Migrate TRTOverlay Algorithm to use thread-safe random number service

Merged John Derek Chapman requested to merge jchapman/athena:TRTOverlay_IAtRNGSvc_master into master

Switching TRTOverlay to use IAthRNGSvc will change the TRT Overlay output as the random seeds will change slightly.

Also took the opportunity to update the syntax used for some other configurable properties.

Edited by John Derek Chapman

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