An interest in running simulations of the CBM experiment with beam from sis18. Adds much setup
based on full electron setup. Magnet, TRD, and psd geometries removed from setups.
Magnetic field same as before but rescaled to 30%.

GDML script for beam window, effectively a smaller STS beampipe is included.
GDML script for elarged target (aka MVD) box design.
pipe_v22c which is root geometry binary with combines these two geometries.

David Emschermann authored 2 years ago and Pierre-Alain Loizeau committed 2 years ago

- 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

Similar to platform_v16 but shifted by 40cm. Updates the setup files.