Draft: Resolve "Implement ci_HCAL"

Closes #24 (closed)

changed milestone to %Translate central reference detectors

added hack-a-thon label

added 10 commits

• 9d158482 - Added Ar10CO2 material
• 56570e61 - Working on ci_GEM, issues with constructing layers in volume
• 46746e65 - Working on ci_GEM, volume issue
• c070fc6a - Testing .cpp with w/o using xml
• d8be9a8a - Testing .cpp with w/o 2 using xml
• 614867cf - added Ar10CO2
• 32fc5584 - Changed typo
• 6fb452b5 - First HCAL run with hardcoded .cpp values
• 0189c6d2 - Merge branch '24-implement-ci_hcal' of...
• 1fc5a87d - First run with hardcoded values

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added 1 commit

• 02915906 - 2nd hard codedcheck

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added Doing label

added 2 commits

• 09956495 - Just current
• 89769713 - Current ci_HAL.cpp

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requested review from @jihee.kim

added 1 commit

• 86aba630 - changed ci_GEM

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added 1 commit

• 57cf00b9 - Changed .xml files and ci_GEM.cpp

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added 1 commit

• ea7c9971 - changed .xml

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added 1 commit

• 98397743 - changes

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