Add adamantine & silvered physical damage types to immunities, resistances, and vulnerabilities

[arbron]

Currently the system support "Non-Magical Physical" in damage resistances and related fields to cover the resistance to "Bludgeoning, Piercing, and Slashing from Nonmagical Attacks" commonly found on monsters. Another common variation found quite frequently is "Bludgeoning, Piercing, and Slashing from Nonmagical Attacks that aren't Silvered" and "Bludgeoning, Piercing, and Slashing from Nonmagical Attacks that aren't Adamantine".

Both of these two variations are common enough that they should be added to the list of options. This would not only improve the data stored on characters, but also give role automation systems the data they need to properly apply damage by checking if the attacking weapon is silvered or adamantine.