Improve entity hierarchy by adding Mob interface.

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

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

@@ -3,7 +3,7 @@ package org.bukkit.entity;
 /**
  * Represents a Slime.
  */
-public interface Slime extends LivingEntity {
+public interface Slime extends Mob {
 
     /**
      * @return The size of the slime
@@ -14,19 +14,4 @@ public interface Slime extends LivingEntity {
      * @param sz The new size of the slime.
      */
     public void setSize(int sz);
-
-    /**
-     * Set the {@link LivingEntity} target for this slime. Set to null to clear
-     * the target.
-     *
-     * @param target the entity to target
-     */
-    public void setTarget(LivingEntity target);
-
-    /**
-     * Get the {@link LivingEntity} this slime is currently targeting.
-     *
-     * @return the current target, or null if no target exists.
-     */
-    public LivingEntity getTarget();
 }