New elements should always be connected by its central magnetic point

For better usability, all new elements should be added and connected to the previous one by the center magnetic point. As you see on the reproducer video attached, some elements have this behavior, but some don't.

For the one's that doesn't have this behavior, the user needs to reposition the connector on two elements, making the authoring experience more difficult. 

Acceptance Criteria:

New nodes created should be linked by its central magnetic point except:

Gateways and the node connecting to and from it.