Removed accept from create charging station

Charging station creation now happens with one of the following
commands:
- CreateChargingStationCommand
  This command already existed but previously contained an accept
  parameter which indicated whether the operator creating the charging
  station accepts it as part of the charging infrastructure. This
  behaviour has been moved to a new command.
- CreateAndAcceptChargingStationCommand
  This command is new and represents the situation which was previously
  represented with the accept parameter being set to true. This command
  creates a charging station and accepts it as part of the charging
  infrastructure.