Includes the core functionality to have Units that can carry other units (Trireme, Sail, etc. in Civilization).
Transport provides a mixin style applicator which accepts a Unit (or something that extends Unit) class and adds
the required methods from ITransport, e.g. class SomeTransport extends Transport(SomeBase) { /* ... */ }.
TransportManifests are used to track what cargo a Transport is carrying. and the TransportRegistry is used to
retrieve these manifests.
Includes Stowed and Unloaded Rules triggered when the corresponding action is performed on a Transport.
Hopefully, the way this has been written, it should be possible to have any type of unit be a Transport so you could
have Air Units, Land Units, or even Diplomatic Units...