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23.0-cleanup2-PixelConditionsAlgorithms

Shaun Roe requested to merge sroe/athena:23.0-cleanup2-PixelConditionsAlgorithms into master

Following on from !55973 (merged), this optimises the pixel db dead map parsing function and incidentally solves ATLASRECTS-6600, by allowing essentially any delimiter. Rough comparative timing in std::chrono 'ticks' for 164 entered elements:

algorithm time
Original 1100
regex_iterator 4000
this MR 110

The regex_iterator solution (not shown here) ensured greater format conformity but the slowdown was too great a penalty.

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