Add some Car Mode automation
It would be nice to be able to tweak Podcast Addict behaviour while in Car Mode, for whose who don't/can't use Android Auto.
When the phone is in Car Mode, aka. when connected to a given Bluetooth device, Podcast Addict behaviour could be tweaked:
* Player is changed automatically to Car Mode
* Volume level could be set to a fixed value (85% for example) as one is likely to change the volume using the car audio
* Starting Podcast Addict would directly open the player screen, avoiding spurious manipulation from user while driving
* Player could be paused if main power is disconnected, as it's likely that Car audio receiver has been switched off, but bluetooth will only be reported as disconnected after a 30s timeout