Always render groups/areas in a single column

[balloob]

Breaking change

Proposed change

When generating a lovelace config, make sure that all entities belonging to a single group or area are shown in a single column.

Also promotes grid card to be always loaded and horizontal/vertical stack to be lazy loaded. Those should be phased out as it's just a grid with certain options.

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After:

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (thank you!)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Example configuration

Additional information

• This PR fixes or closes issue: fixes #
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Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• Tests have been added to verify that the new code works.

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

• Documentation added/updated for www.home-assistant.io