N°2313 - Markup extensibility: Add meta information and hooks

Admin. console:
- Class and id on object form
- Class current and target state on object transition form
- Object form mode (view/edit/create/stimulus)
- Object attributes: Attribute code, attribute definition class and raw value
- Navigation menu: Their IDs on group and items
- Actions menu: Their IDs on items

Portal:
- Object attributes: Attribute code, attribute definition class and raw value

core/attributedef.class.inc.php

@@ -1022,6 +1022,14 @@ abstract class AttributeDefinition
 			$oFormField->AddValidator(new \Combodo\iTop\Form\Validator\Validator($this->GetValidationPattern()));
 		}
 
+		// Metadata
+		$oFormField->AddMetadata('attribute-code', $this->GetCode());
+		$oFormField->AddMetadata('attribute-type', get_class($this));
+		if($this::IsScalar())
+		{
+			$oFormField->AddMetadata('value-raw', $oObject->Get($this->GetCode()));
+		}
+
 		return $oFormField;
 	}