Efficiency modeling refinements master issue

[kylecarow]

• Reusable code for component efficiencies #279
  • Follow-on work:
    • refactor to introduce FCEfficiency
    • refactor to introduce EMEfficiency
      • how do we handle EM having multiple interpolators?
    • refactor to introduce AuxSupplyEfficiency
      • Issue Refactor alt_eff to be a FuelConverter/ReversibleEnergyStorage level aux load efficiency penalty #286
      • PR Introduce aux efficiency field aux_eff for FC and RES, deprecate Conv alt_eff #304
• Convenience functions for maps Implement convenience SI/Atkinson/Diesel/HD_Diesel fuel converter efficiency maps #275