Refactor/config and argparse

[j-brendel]

@stefansc1 additionally to review, please:

• move the block of parser.add_argument from main into util
• check below parser.add_argument block in main: does this still make sense?

  # arguments relevant to SpiceEV, setting automatically to reduce clutter in config
  args.ALLOW_NEGATIVE_SOC = True
  args.attach_vehicle_soc = True