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DORDER_DISEMBARK

order a droid to disembark from a DROID_TRANSPORTER (i think?)

currently there's no way to tell if a droid is on a transport (you'll have to remember from the point where you tell droid to DORDER_EMBARK), and there's no way to know if a transport is landed or not (I think they need to be landed before droids can leave them)