Remove const_cast in SCT_ServMatFactoryDC2/3 (ATLASSIM-4009)

Susumu Odarequested to merge
oda/athena:master-const_cast-v2 into master

Remove const_cast in SCT_ServMatFactoryDC2/3 by defining elements and materials.

https://its.cern.ch/jira/browse/ATLASSIM-4009

Edited by Susumu Oda

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