api: move isDead from NPC to Actor

runelite-api/src/main/java/net/runelite/api/Actor.java

@@ -259,4 +259,11 @@ public interface Actor extends Renderable
 	 * @param overheadText the overhead text
 	 */
 	void setOverheadText(String overheadText);
+
+	/**
+	 * Returns true if this actor has died
+	 *
+	 * @return
+	 */
+	boolean isDead();
 }

runelite-api/src/main/java/net/runelite/api/NPC.java

@@ -68,11 +68,4 @@ public interface NPC extends Actor
 	 */
 	@Nullable
 	NPCComposition getTransformedComposition();
-
-	/**
-	 * Returns true if this NPC has died
-	 *
-	 * @return
-	 */
-	boolean isDead();
 }