Animal Pens 1.3.1

• Adds ability to define which items can attack animal pens using can_attack_pen item tag.
• Adds ability to define which items can attack aquarium using can_attack_aquarium item tag.
• Implements ability to hold attack button to kill entities
  • Adds config option to define cooldown value
• Implements animal variant storage
  • Variants can be viewed and selected by clicking on animal pen/aquarium with empty hand
  • The menu allows to select/delete animal variant
  • Adds config option to limit amount of variants players can store
  • Supports buttons: arrow up, arrow down, enter and delete
• Implements display size changing using the new menu
  • Supports arrow left and arrow right to change size by 1 step
• Implements cooldown viewing in the new menu
• Implements new config value population on installing new version.