Martens: Vertical Predators and New Forest Mechanics

Add Pine and Stone Martens to enhance the ecology of forests and mountains.

Behavior and Movement:

Climbing: Martens can scale vertical surfaces and trees.

Hunting: They naturally hunt rabbits and chickens.

Pest Control: Martens are hostile towards Silverfish and Endermites.

Item Interaction: Stone Martens pick up dropped items and move them.

Habitat:

Pine Marten: Spawns in Taiga.

Stone Marten: Spawns in Stony Peaks.