Add and modify geometries and setups for CBM@SIS18
- add TOF tof_v21a_1h_sis18, refs #2482
- fix radlength bug in TOF@SIS18 21a geometry
- add initial version of STS in a CBM@SIS18 setup, refs #2482
- Add initial versions of platform and tof in a CBM@SIS18 setup, refs #2482
- add STS v21f_sis18 for SIS19 setup, refs #2842
Draft status: To be rebased (should be trivial) and merged only after !172 (merged) is merged
Edited by Pierre-Alain Loizeau