Better Difficulty

🌕 Added a brand new Blood Moon spawn system (BloodMoonSpawner) running alongside vanilla spawning.
🩸 Added new Blood Moon schedule modes:

• chance
• nth_night
• full_moon

⚙️ Added new blood_moon config options in config/betterdifficulty/difficulty.json:

• schedule_mode
• nth_night
• spawn_whitelist
• spawn_blacklist
• mobs_drop_loot

🏷️ Added a runtime tag for mobs spawned by Blood Moon: bd_bloodmoon_spawned.

Changed

🔧 Reworked Blood Moon from the old spawn-duplication model into a dedicated custom spawner.
🌌 Changed surface_spawn_only default value to false for behavior closer to Lumien Bloodmoon.
🚫 SPAWN_BLOCKER is now bypassed while Blood Moon is active.
♻️ /betterdifficulty config reload can now immediately stop an active Blood Moon if blood_moon.enabled is set to false.

Fixed

🛠️ Unified Fabric and NeoForge behavior for Blood Moon anti-farming loot handling.
✅ Improved Blood Moon schedule stability and added stronger tests for nth_night, full_moon, and scheduled starts.
🧪 Added tests for whitelist/blacklist spawn filtering and surface_spawn_only behavior.