Make more complex transport entry rules possible
By having more than one action that results in a unit entering another unit it becomes possible to have more complex rules. An example I have been talking about since 2019 is to use one fake generalized variant to detect transport to transport transfers and then charge a higher move cost.
Fake generalize the actions "Transport Load" and "Transport Board" so there are three of each. Add the new fake generalized "Transport Embark 4" as a new variant of embark.
3.2 only for now as Lexxie is the only ruleset author to request support for detecting transport to transport transfer when asked if it was needed.