Make IO ports not transfer the cell if no items were moved and in "After work done" mode

[S4mpsa]

With the change, the cell will not move through the IO port unless it actually does some work, e.g. empties its contents to the network (waits for space to be available) or pulls items into the cell (waits for items to be available).

This allows for more powerful automation using IO ports.

[ivelieu]

This will break IO port automation that specifically relies on this functionality (notably, some of my vacuum nuke approaches which are used by a fair few people). Better to add this behavior as a fourth mode.