Add a "transfer all" function to fuel transfer

[Nerdy314159265]

I think it'd be very useful to have a transfer all option to fuel transfer, as in, I can select a single tank and hit transfer all out and it pumps it's fuel out to all tanks evenly or the reverse if I select transfer all in.

This would allow you to pool all your fuel together in a specific tank, which is helpful for keeping some designs stable, without having to manually select every single tank on your ship. Or would allow you to pump all the fuel out of a drop tank if it wasn't set up to drain first naturally.