Fix reported defects

[matth-x]

Fix defects which appeared during an integration test. Summary:

• Fix crash when locally deauthorizing connectorIds > 1 (see fixed endTansaction method for connectors other than 1 #275)
• Add config Cst_TxStartOnPowerPathClosed:
  • false (default): Tx start point is when charging is authorized and cable is plugged
  • true: Tx start point is when the vehicle actually started charging
• Don't initialize FirmwareManagement modules by default. Accept UpdateFirmware and GetDiagnostics only when corresponding handlers are set
• UnlockConnector reports proper status when connector lock handler is not set
• SmartCharging module edge cases fixes