Fix Component Reference abstraction

Things to change:

1) Component Reference mechanism in the studio uses a COMPONENT_REFERENCE widget type. This, in the studio, because target execition environment is DI, give a choice of an embedded component properties, or a refernece to another component's properties. If embedded, this widget will create the propeerties, and render the MAIN form to configure these properties right in line below the reference type (this, <list of components>) combox box. If it's not embedded, the combo box shows the referenced component.

This changes the way the SalesforceConnectionProperties is handled, the referencedConnection in the SFCP is removed, and the component reference just points to the desired SFCP.