Add CBM@SIS18 simulation macros from mCBM fork

Draft status: To be rebased (should be trivial) and merged only after !807 (merged) is merged

Not sure whom to assign for the review

assigned to @p.-a.loizeau

mentioned in merge request !809 (merged)

marked this merge request as ready

added 14 commits

• 7a041401...d4a156d1 - 11 commits from branch computing:master
• 16eed7ad - Add transport macro and adapt event display macros for CBM at SIS18, refs #2482
• ed5662e5 - CBM at SIS18: correct target position to z = 12.5 cm, refs #2482
• f7f67f32 - Add transport macro for SIS19, refs #2482

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Dear @f.uhlig, @p.-a.loizeau,

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

merged