Fix license headers in reco directory

Fix license headers in the last sub directories (base, eventbuilder and steer) of the reco directory. Add missing license headers. Add committer if missing.

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Dear @f.uhlig, @v.friese, @p.-a.loizeau, @d.smith,

you have been identified as code owner of at least one file which was changed with this merge request.

Please check the changes and approve them or request changes.

added CodeOwners label

Approve.

added 1 commit

• 8c2c8923 - Fix license headers in reco directory

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resolved all threads

@p.-a.loizeau, @v.friese, @praisig

do you also approve the changes?

approved this merge request

I am fine with the changes.

Cheers

added 3 commits

• 8c2c8923...57717f4a - 2 commits from branch computing:master
• 4d5bfe09 - Fix license headers in reco directory

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enabled an automatic merge when the pipeline for 4d5bfe09 succeeds

merged