Overview:
Load Trigger: This trigger is fired once the TaskExecuter has finished its loadtime and just before it moves the flowitem into the TaskExecuter.
Unload Trigger: This trigger is fired once the TaskExecuter has finished its unloadtime and just before it moves the flowitem into its destination.
Access variables:
item: the item that is about to be loaded/unloaded
current: the current object
station: the station where the current object is loading from or unloading to
