Mob proof crystals [Fabric]

This update adds:

• A configuration file where you can tweak the radious, vertical position of the affected area and a custom crystal name
• The ability to rename end crystals to a specific name in order to make them work as intended. This can be changed in the configuration file.

The default value of the specific, configurable, custom name is empty to make the mod consistent with previous versions. If you want to make the crystals be specificly renamed in order to make them work, you will need to modify the crystal.properties file generated in your .minecraft folder and set a value to the crystal-name property.