Include other standalone buildables that use power

Fluid Pumps, Truck Stations, etc., despite not serving as notable machines or containers in their own rights, can potentially be a noteworthy part of the power consumption of a factory. Currently, the app doesn’t have any way of making a note of these things.

Similarly and inversely to the inclusion of the Geothermal Generator - a buildable whose only purpose in the modeler is to account for the generation of power in the power summary and has no connections - it stands to reason that buildables that consume power could be included as well, so that users don’t underestimate how much power they will need to be generating for their factories and, however unlikely, run into snags during execution due to forgetting enough “small things” that add up.