feature addon registry configuration

common/api/core/src/main/java/com/dfsek/terra/api/structure/feature/Feature.java

@@ -8,10 +8,11 @@
 package com.dfsek.terra.api.structure.feature;
 
 import com.dfsek.terra.api.structure.Structure;
+import com.dfsek.terra.api.util.StringIdentifiable;
 import com.dfsek.terra.api.world.WritableWorld;
 
 
-public interface Feature {
+public interface Feature extends StringIdentifiable {
     Structure getStructure(WritableWorld world, int x, int y, int z);
     
     Distributor getDistributor();