updated to new "b2vapi" of BMW ConnectedDrive

[ChristianKuehnel]

Description:

To support users from USA and Canada, the bimmer_connected library moved to a different API on the BMW servers. As this is a breaking changes for the bimmer_connected library, several changes were required to the Home Assistant modules.

⚠️ Breaking change:
The countryattribute in the configuration is now replaced with a region attribute.

Related issue (if applicable): fixes N/A

Pull request in home-assistant.github.io with documentation (if applicable): home-assistant/home-assistant.io#4947

Example entry for configuration.yaml (if applicable):

bmw_connected_drive:
  somename:
    username: USERNAME_BMW_CONNECTED_DRIVE
    password: PASSWORD_BMW_CONNECTED_DRIVE
    region: <one of "north_america", "china", "rest_of_world">

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox. Your PR cannot be merged unless tests pass

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated in home-assistant.github.io

If the code communicates with devices, web services, or third-party tools:

• New dependencies have been added to the REQUIREMENTS variable (example).
• New dependencies are only imported inside functions that use them (example).
• New dependencies have been added to requirements_all.txt by running script/gen_requirements_all.py.
• New files were added to .coveragerc.

If the code does not interact with devices:

• Tests have been added to verify that the new code works.

[MartinHjelmare]

Components should not create home assistant groups. That is for users only to do.

[MartinHjelmare]

I don't think we should create groups automatically. Let the users do that if they want.

[ChristianKuehnel]

OK, removed the groups again.

I though it would be handy, as a vehicle might end up with 10-15 individual sensors. And creating the groups manually is annoying...

[ChristianKuehnel]

Implementation and tests completed, ready to be reviewed and merged.

[MartinHjelmare]

Looks great! Two small comments.

[MartinHjelmare]

Please keep the blank line between standard library and 3rd party imports.

[MartinHjelmare]

Please sort 🔤 within groups standard library, 3rd party and homeassistant imports.

[MartinHjelmare]

There should be a blank line here between logging and voluptuous.

[ChristianKuehnel]

fixed

[MartinHjelmare]

Thanks!