Add a backsplash from countertop level settings

Add a backsplash as a countertop-level modification, set its height and shift it up, and keep it from running behind the tiles.

1. A backsplash is added as a countertop-level modification.

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2. Set the height (100 mm is a typical value) and shift it up.

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3. In the extension options set the back extension to zero so the backsplash does not run behind the tiles.

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