Add ChunkEvent.Generated

src/main/java/org/spongepowered/api/event/world/chunk/ChunkEvent.java

@@ -83,10 +83,17 @@ public interface ChunkEvent extends Event {
         interface Post extends Save {}
     }
 
+    /**
+     * Called when a new {@link Chunk} was generated.
+     */
+    interface Generated extends ChunkEvent {
+
+    }
+
     /**
      * Called when a {@link Chunk} is done loading.
      */
-    interface Load extends ChunkEvent, Save.Pre {
+    interface Load extends ChunkEvent {
 
         /**
          * Gets the {@link Chunk} being changed.