Please add applyDamage hook

As previously discussed in discord. I'd like to have a hook to intercept and change applyDamage. This would probably mean I'll need to refactor Automate Damage but down the line my module will break less things.

Currently, AD is calculating damage before the function is called and that causes the dialog box to have the modified value of the damage after calculation which I assume is something against the system's interest but in general I don't want to even affect that.