* Enable BMW component to be unit system aware
* lint fixes
* use constants for config entries
* remove configuration from component and rely only on HA config of unit_system
* remove unused import
* update code to reflect feedback
* lint fixes
* remove unnecessary comments
* rework return statement to satisfy pylint
* more lint fixes
* add tests for volume utils
* lint fixes
* more lint fixes
* remove unnecessary comments
uchagani