Poisonous caves update-blocks and items

🧪 Sulfur & Cinnabar Sulfur gains new uses like dynamite and chemical recipes. Cinnabar can be smelted into Liquid Mercury. 🧪 Liquid Mercury A dangerous liquid that is heavier than water. Players move slower inside and get Mercury Poisoning after exposure. Used for crafting and traps. ❄️ Freezer Machine A block that uses cold fuel: snow, ice, packed ice, or blue ice. Water → Ice Lava → Cobblestone Mercury → Solid Mercury ⚪ Solid Mercury A material between iron and diamond. Used for tools, weapons, and armor with poison resistance. 🧱 Mercury Blocks Adds Mercury Blocks, Bricks, Smooth Mercury, Cracked Bricks, and Mercury Spikes. Spikes damage and poison. 🌡️ Mercury Thermometer Shows biome temperature and predicts snow, rain, or heat. 🟦 Mercury Pools A dangerous cave biome with mercury lakes, cinnabar, and toxic hazards. 🟦 Mercury Cube A hostile slime-like mob that causes poisoning. Giving it a block makes it peaceful. Drops Mercury Balls. 🏹 Mercury Arrows Arrows with poison effects. 🧰 Mercury Chest A trap chest that causes Instant Damage, Poison, and Nausea for 4 seconds. Goal: Make caves more dangerous, rewarding, and full of discoveries. Poisonous Caves: The underground is no longer only stone and ores