cleaned some unused code

Author: ValentinGurkov

Questing/Goal/ConversationGoal.cs

@@ -1,6 +1,5 @@
 using RPG.Events;
 using RPG.NPC;
-using UnityEngine;
 
 namespace RPG.Questing {
     public class ConversationGoal : Goal {

Questing/Goal/KillGoal.cs

@@ -1,6 +1,5 @@
 using RPG.Attributes;
 using RPG.Events;
-using UnityEngine;
 
 namespace RPG.Questing {
     public class KillGoal : Goal {

Questing/Goal/PickupGoal.cs

@@ -1,6 +1,5 @@
 using RPG.Combat;
 using RPG.Events;
-using UnityEngine;
 
 namespace RPG.Questing {
   public class PickuppGoal : Goal {

Questing/Quest.cs

@@ -5,7 +5,6 @@
 using UnityEngine;
 
 namespace RPG.Questing {
-    //[CreateAssetMenu(fileName = "Quest", menuName = "Quest/Create New  Quest", order = 0)]
     public class Quest : MonoBehaviour {
         public List<Stage> Stages { get; set; } = new List<Stage>();
         public string QuestName { get; set; }