Material scan for ecal

The material scan behind the ECAL looks like it has way too much material in the ECAL barrel region, with 1e2 X0.

https://eicweb.phy.anl.gov/EIC/benchmarks/detector_benchmarks/-/jobs/411758/artifacts/file/results/images/materialScanEcal.png

We should figure out why that is the case, and if other parts of the material scans are similarly affected.

While on the topic:

• add missing materials to the table of known materials (or figure out an automatic numbering scheme)
• add a legend
• use actual regions in compact xml and material scan instead of mathematical cylinders