Collects carts when carts pass over an unpowered chest marked as a dispenser; dispenses carts when power flips on if no cart is already above the dispenser.
Implementers of CartMechanism are intended to be singletons and do all their logic at interation time (like non-persistant mechanics, but allowed zero state even in RAM).
Stores the tuple of three blocks over which any typical CartMechanism is implemented, and also performs detection of two of the blocks if only one is given.
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