cleanup suggested by clang-tidy

enabled an automatic merge when the pipeline for 2bf7f0a3 succeeds

aborted the automatic merge because source branch was updated

added 4 commits

• 25f3f95f - corr memory leak
• 6832e894 - corr code critized by memory leak checker
• b09814fa - tidy/modernize-use-auto
• a36e4fb1 - revert change that requires <ranges>, not yet available on mac_x64

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added 2 commits

• 64b5a5f6 - emplace_back w/o c'tor
• 18faee28 - revert one more <ranges>

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added 1 commit

• d0094ab9 - revert one more <ranges>

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merged

mentioned in commit 12268ede