Energy Dashboard enhancements

Hi,

I have recently adopted the energy Dashboard and love it but feel there is a lot of opportunity to improve this.

Firstly I feel there should be a rate table detailing unit costs and standing costs.

Grouping of individual devices by room would make things clearer.

Accepting energy device class for gas consumption.

Would also be good to see the standing fees added to the daily costs table.

Thanks for the great work