add `constexpr` to ChannelIDs, and make constructors `explicit`

continuation of !2956 (merged): add as much constexpr as possible, and make single argument constructors explicit

as this sits on top of !2956 (merged), it (also) requires Rec!2361 (merged), Phys!886 (merged), Boole!332 (merged) In addition, needs Lbcom!546 (merged), Rec!2362 (merged) (which sits on top of Rec!2361 (merged)), Boole!333 (merged) (which sits on top of Boole!332 (merged)), Panoramix!86 (merged), Run2Support!10 (merged)

added modernisation label

changed title from Constexpr explicit channelids to {+add constexpr to ChannelIDs, and make constructors explicit+}

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• 8f366aea - constexpr all channelIDs, make single-argument constructors explicit

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• fa83e819 - constexpr all channelIDs, make single-argument constructors explicit

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• e9694738 - constexpr all channelIDs, make single-argument constructors explicit

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/ci-test --merge Rec!2361 (merged) Phys!886 (merged) Boole!332 (merged)

added ci-test-triggered label

• [2021-03-06 21:46] Validation started with lhcb-master-mr#2002
• [2021-03-07 11:23] Validation started with lhcb-master-mr#2003

mentioned in commit Lbcom@dc7fefce

mentioned in merge request Lbcom!546 (merged)

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mentioned in commit Lbcom@d71829d0

mentioned in commit Rec@50adc7c6

mentioned in merge request Rec!2362 (merged)

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mentioned in commit Boole@98802a14

mentioned in merge request Boole!333 (merged)

mentioned in commit Boole@13081eb4

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