Add column to filament list for the total available weight of that filament

[scottessner]

When I am planning to print, I would like to know how much filament I have available across all the spools of a particular filament. This would be a quick way to evaluate my total stock of filament when I have multiple spools.

I would like to see a new column added to the filament list view that is the total of remaining weight of all spools of that filament. I would expect that this value to be sortable like the rest of the columns.

I can currently probe into each filament one by one and view available spools to get a total. We could also consider a view of spools sorted by filament, but we wouldn't be able to sort by the total available weight.