Energy tab in inspector should show potential power consumed of child circuits

Currently, the potential power consumed value in tooltips and the inspector only display the total potential for direct consumers; child circuits separated by transformers are not included. It would be helpful to both new and experienced players to display a transformer in the consumers list as having a consumption potential equal to that of the transformer's child circuit. This would be especially helpful in a "main bus" situation where there is a large, central bus that contains only generators and consumer transformers. In this case, when the transformers are consuming power, the value will display something like "720 W / 0 W", which makes little sense, especially to new players.