Changes:
- Fixed a bug that caused the plugin to generate invalid furnace recipes.
- Refactored the source code of the plugin (slightly improved the API).

Fixed a bug with the furnace recipe. The plugin should now work with other plugins nicely.

- Added the option to enable smelting coral to get the dead variant.
- Added the option to only allow certain player's coral to stay alive.
- Added a command to keep track of that option.