This allows unique identification across saves. The front-end needs to
be able to differentiate the first carrier in game A and the first
carrier in game B, but because carriers (and other non-airfield CPs) are
assigned IDs sequentially, collisions were to be expected. The front-end
can't tell the difference between a reloaded game and a new turn, so we
need to ensure different IDs across games.
This is a handy cleanup anyway, since callers constructing CPs no longer
need to manually track the CP ID counter.
Fixes https://github.com/dcs-liberation/dcs_liberation/issues/2078.
operation_ids give us better function names when generating the
typescript API from the openapi.json. BaseModel.Config.title does the
same for type names. Response models (or 204 status codes) need to be
explicit or the API will be declared as returning any.
