Add save cosplay saber force uses

[libraryaddict]

Adds ability to save uses of cosplay saber.
In my usecase, I mostly just need to disable the cosplay saber when using familiars that deal damage.

This is sub-optimal, in that if you're just limiting it to a value between 0 and 5, it may burn the uses on the tasks that don't need it. Fixing that however, would be a proposal of a knapsack script.

[Pantocyclus]

The use case described here is pretty niche, but I can also imagine the possibility of some hypothetical world event utilizing some of the saber skills, so I'm not against it.

The implementation is fine too - we make the same greedy assumption in many other places in the script. I think having a knapsack is out of scope for now - users who need that level of optimization should probably create and maintain their own personal fork.