Suggestion: sub-attribute label rendering improvements

[vercotux]

In Form Builder, when rendering sub-attributes, allow for greater control over labels.

• Allow to completely disable labels. Currently even when we set the 'label' setting to false/null/'' the label container will still render which adds an empty vertical margin to the nested group. It should probably follow the ActiveForm 'showLabels' setting, which is currently ignored.

• Provide a way to automatically acquire labels from the model's getAttributeLabel() method. Currently we need to manually do this for each attribute in the nested group.

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