WorldProtect

- 🔥 Fire protection (NEW)
- Added the first WorldProtect feature specifically for fire protection: new flag fire-spread.
- Fire-spread blocks fire from appearing/spreading inside regions where fire-spread = deny.
- Updated for the new game version where fire behaves like a fluid (FireFluidTicker); WorldProtect now cancels those fire fluid updates in protected areas.

🏷️ Flags / Defaults
- Default for NEW regions: fire-spread = deny (anti-grief by default).
- Global region (__global__) default: fire-spread = allow (vanilla behavior outside claims unless admins change it).
- Improved global defaults so wilderness interactions don’t get accidentally blocked after updates (new flags won’t silently default to deny in __global__).
- NEW: Added config blocks to control default flags:
  - defaults.region.* lets admins choose which flags are enabled/disabled when a new region is created.
  - defaults.global.* lets admins choose which flags are enabled/disabled for the global region (__global__).

- 🛠️ Fixes & Code improvements (vs 1.0.7)
- Fixed multiple permission/flag issues reported by players (interactions, farming/harvesting, item pickup, etc.) caused by global defaults after adding new flags.
- Fixed error spam / stability problems and improved internal safety checks to prevent event handling crashes.
- Refactored and cleaned up code (removed duplicated logic, improved null-safety and readability) while keeping behavior the same.