[Xenocide-programming] datainterfaces update

[Tamas T. <te...@cs...>]

I'm not entirely sure about passive ICarriable; how will the battlescape
engine decide whether a unit can fire with the (per definitionem)
ICarriable item in its hand? IMO it would be logical to have basic usage
types put into all battlescape items, so that one just overloads the
throw(...) for grenades and such, maybe using another class that will
be intantiated during mission loading?

centurion