Improve entity hierarchy by adding Mob interface.

By: md_5 <git@md-5.net>

paper-api/src/main/java/org/bukkit/entity/Creature.java

@@ -4,23 +4,4 @@ package org.bukkit.entity;
  * Represents a Creature. Creatures are non-intelligent monsters or animals
  * which have very simple abilities.
  */
-public interface Creature extends LivingEntity {
-
-    /**
-     * Instructs this Creature to set the specified LivingEntity as its
-     * target.
-     * <p>
-     * Hostile creatures may attack their target, and friendly creatures may
-     * follow their target.
-     *
-     * @param target New LivingEntity to target, or null to clear the target
-     */
-    public void setTarget(LivingEntity target);
-
-    /**
-     * Gets the current target of this Creature
-     *
-     * @return Current target of this creature, or null if none exists
-     */
-    public LivingEntity getTarget();
-}
+public interface Creature extends Mob {}