Move health stuff from LivingEntity to Entity.

By: angelsl <angelsl@rpm>

paper-api/src/main/java/org/bukkit/Entity.java

@@ -32,4 +32,17 @@ public interface Entity {
      * @return Entity ID
      */
     public int getEntityID();
+    /**
+     * Gets the entitys health from 0-20, where 0 is dead and 20 is full
+     *
+     * @return Health represented from 0-20
+     */
+    public int getHealth();
+
+    /**
+     * Sets the entitys health from 0-20, where 0 is dead and 20 is full
+     *
+     * @param health New health represented from 0-20
+     */
+    public void setHealth(int health);
 }