Refactor ActionExecutor to use player UUID and cleanup context

api/src/main/java/de/oliver/fancynpcs/api/actions/executor/ActionExecutionContext.java

@@ -4,11 +4,13 @@
 import de.oliver.fancynpcs.api.actions.ActionTrigger;
 import de.oliver.fancynpcs.api.actions.NpcAction;
 import de.oliver.fancynpcs.api.actions.types.BlockUntilDoneAction;
+import org.bukkit.Bukkit;
 import org.bukkit.entity.Player;
 
 import javax.annotation.Nullable;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.UUID;
 
 /**
  * Context for executing a sequence of NPC actions initiated by different triggers.
@@ -30,7 +32,7 @@ public class ActionExecutionContext {
     /**
      * The player involved in the action, may be null if no player is involved.
      */
-    private final @Nullable Player player;
+    private final @Nullable UUID player;
 
     /**
      * A list of NpcActionData instances representing the sequence of actions
@@ -60,7 +62,7 @@ public class ActionExecutionContext {
      * @param npc     the NPC that the action is being executed on
      * @param player  the player involved in the action, may be null if no player is involved
      */
-    public ActionExecutionContext(ActionTrigger trigger, Npc npc, @Nullable Player player) {
+    public ActionExecutionContext(ActionTrigger trigger, Npc npc, @Nullable UUID player) {
         this.trigger = trigger;
         this.npc = npc;
         this.player = player;
@@ -164,10 +166,18 @@ public List<NpcAction.NpcActionData> getActions() {
         return actions;
     }
 
-    public @Nullable Player getPlayer() {
+    public UUID getPlayerUUID() {
         return player;
     }
 
+    public @Nullable Player getPlayer() {
+        if (player == null) {
+            return null;
+        }
+
+        return Bukkit.getPlayer(player);
+    }
+
     public int getActionIndex() {
         return actionIndex;
     }

api/src/main/java/de/oliver/fancynpcs/api/actions/executor/ActionExecutor.java

@@ -21,15 +21,18 @@ public static void execute(ActionTrigger trigger, Npc npc, Player player) {
             }
         }
 
-        ActionExecutionContext context = new ActionExecutionContext(trigger, npc, player);
+        ActionExecutionContext context = new ActionExecutionContext(trigger, npc, player.getUniqueId());
         runningContexts.put(key, context);
 
         FancyNpcsPlugin.get().newThread("FancyNpcs-ActionExecutor", () -> {
             while (context.hasNext()) {
                 context.runNext();
             }
             context.terminate();
+
+            runningContexts.remove(key);
         }).start();
+
     }
 
     private static String getKey(ActionTrigger trigger, Npc npc, Player player) {