Added Object durability additional rule

Hello there!

I was playing Dragonbane and testing out my stuff and I came across a problem. The core game really does not have a lot of guide in how to deal with bigger objects like doors or pillars or anything like that. You can give doors armor and HP which for me feels kinda silly. I dont want to create a full object NPC list with different armor and hp to doors and objects.

So I got inspired to create a custom rules for how to deal with bigger objects in game called integrity, It works similarily to Durability and is determined byt the size and the material of the object.

Hopefully this helps you as well!