Adapt changes made in !2920 to current Gaudi & C++ usage

• use extend_interfaces and extend, drop explict constructor
• prefer constexpr over preprocessor
• prefer constexpr variables anonymous namespace over class static constexpr
• amalgamate component header into component source file
• proper use of span, i.e. pass by value, not reference

added cleanup label

changed title from Adapt changes !2920 (merged) to current Gaudi & C++ usage to Adapt changes made in !2920 (merged) to current Gaudi & C++ usage

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• 848a5fdf - Adapt changes !2920 (merged) to current Gaudi usage

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added RTA label

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• dfe20ee7 - Adapt changes !2920 (merged) to current Gaudi usage

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• c4b773b7 - Adapt changes !2920 (merged) to current Gaudi usage

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Is it ready for testing ?

added ci-test-triggered label

• [2022-06-10 15:00] Validation started with lhcb-master-mr#4710

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• 6e8f4103 - Adapt changes !2920 (merged) to current Gaudi usage

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resolved all threads

@sponce this looks ready for the mergehammer

merged

mentioned in commit 78d3a13a

mentioned in issue Moore#444 (closed)