[Feature] Mobile Pipe Dispenser Lays Pipe

[kyle2143]

I actually brought up merging this patch in admin chat last week. It is really good, but the one issue we had with it was that the dispenser would lay pipes before the object actually got to the next tile which looked kinda weird.

There were two proposed solutions iirc. Use a spawn to make it place the pipe after the time it takes to move is complete. And place a pipe when the dispenser leaves a tile, not when it enters one.