WIP: Refactor ElectronPhotonVariableCorrectionTool

Nils Gillwaldrequested to merge
nigillwa/athena:eyVarCorr_refactoring into master

Refactor some components of the ElectronPhotonVariableCorrectionTool:

  • Use switch instead of else-if constructs very possible and reasonable
  • Split getParameterInformationFromConf for better readability

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