-- a drone leaves the warehouse directly to one of its neighbor
-- two drones can cross (if their destination is different)
-- an order only has one destination receptacle
-- a drone only leaves the warehouse if:
--     nbToDeliver + nbDelivering + qtyInReceptacle <= RCAP
--     and tests this hypothesis for every tick
-- a drone must be able to move (max 3 drone neighbors)
-- a drone has max DCAP products
-- a receptacle has max RCAP products
-- only one drone per cell
-- only one drone per receptacle




-- entering the warehouse is done just like any Cell
-- but after one tick, the drone has no position anymore (in the warehouse)
-- every PTIC ticks, all receptacles loose product