Many minor fixes and improvements

Bug fixes

• "Scandinavian miles" setting not being honoured
• S-PIN not being recognized and used for certain mutable actions, #62
• Mutable setting not existing in options and working
• Pre-heater stop not working
• Mutable actions not working correctly for Enyaq iV, #67
• Honk and flash not working, #66
• Optional options in "Set departure schedule" service not working. (Thanks to @hhoefling)

Improvements

• Model image now used for device tracker
• New sensor: minimum charge level. The level that the car charges to directly upon connection to a charger
• Minor improvements in login error handling

Links

• Discord server
• README
• Issues