Revert "removing duplicate aggregation in MyRetroClone/DamageCalculator"

This reverts commit 36b4dc08bb917ad062a20bc682b4359adf14ee9f.
Revert "refactoring all MyRetroClone/DamageResistance classes"

This reverts commit 4946b9aa789df7a296b5bace7b02c9d2c7db0bb7.