Removed unused imports (#75)

UOP1_Project/Assets/Scripts/CameraManager.cs

-using System.Collections;
-using System.Collections.Generic;
-using UnityEngine;
+using UnityEngine;
-using System;
 
 public class CameraManager : MonoBehaviour
 {

UOP1_Project/Assets/Scripts/Characters/Character.cs

-using System;
-using System.Collections;
-using System.Collections.Generic;
-using UnityEngine;
+using UnityEngine;
 
 public class Character : MonoBehaviour
 {

UOP1_Project/Assets/Scripts/InputReader.cs

-using System.Collections.Generic;
-using UnityEngine;
+using UnityEngine;
 using UnityEngine.InputSystem;
 using UnityEngine.Events;
 

UOP1_Project/Assets/Scripts/SpawnSystem.cs

 using System;
 using System.Linq;
-using UnityEditor.PackageManager;
-using UnityEngine.Events;
 
 public class SpawnSystem : MonoBehaviour
 {