Renaming transformers

[mellow olive]

Should have a way of changing the name of Transformers. So the name shows in the Power Grid view. and we can see which subgrid is which.

[uneven furnace]

same idea here, otherwice its getting a mess. Would also be nice, to have the possibility of sorting, or ignoring the single trafos in the overview

[mortal tusk]

when you click on an item, it has a small outline of the grid that the item is associated with. it's a light outline and currently not obvious enough to see readily, but it's there.