Add new DespawnReasons

src/main/java/net/citizensnpcs/api/event/DespawnReason.java

@@ -3,6 +3,8 @@
 public enum DespawnReason {
     CHUNK_UNLOAD,
     DEATH,
+    PENDING_RESPAWN,
     PLUGIN,
+    REMOVAL,
     WORLD_UNLOAD;
 }

src/main/java/net/citizensnpcs/api/npc/NPC.java

@@ -39,7 +39,8 @@ public interface NPC extends Agent {
     public MetadataStore data();
 
     /**
-     * Despawns this NPC.
+     * Despawns this NPC. This is equivalent to calling
+     * {@link #despawn(DespawnReason)} with {@link DespawnReason#PLUGIN}.
      * 
      * @return Whether this NPC was able to despawn
      */