[Feature Request] Add Savage Attacker support

[nschoenwald]

If an actor has a feat called Savage Attacker, add attack activities to their weapons that adapt the damage accordingly.

e.g. an attack that normally deals d8 damage would become 2d8kh. A weapon that normally deals 2d6 damage becomes {2d6,2d6}kh.

For reference:

You’ve trained to deal particularly damaging strikes. Once per turn when you hit a target with a weapon, you can roll the weapon’s damage dice twice and use either roll against the target.

[jagoe]

Thanks for the request.
I'll focus on making this module work as intended for the existing activities for now. Once that's done, this'll be the first new feature though.