Remove WorldStorage and ChunkDataStream

While this is a breaking change, they were not implemented and in their state, not implementable. We remove them now with the intention of something like this returning in the future.

Author: dualspiral

src/main/java/org/spongepowered/api/world/server/ServerWorld.java

@@ -43,7 +43,6 @@
 import org.spongepowered.api.world.explosion.Explosion;
 import org.spongepowered.api.world.generation.ChunkGenerator;
 import org.spongepowered.api.world.server.storage.ServerWorldProperties;
-import org.spongepowered.api.world.storage.WorldStorage;
 import org.spongepowered.api.world.volume.game.InteractableVolume;
 import org.spongepowered.api.world.weather.WeatherUniverse;
 import org.spongepowered.math.vector.Vector3i;
@@ -229,13 +228,6 @@ default boolean restoreSnapshot(final Vector3i position, final BlockSnapshot sna
      */
     Path directory();
 
-    /**
-     * Gets the associated {@link WorldStorage} persisting this world.
-     *
-     * @return The associated world storage
-     */
-    WorldStorage worldStorage();
-
     /**
      * Instructs the world to save all data.
      *