Added new sounds needed for game

Added blackhole swirl texture and materials
Added Magnet, Hunter and Drop core powerups and script overhaul for powerups in general
Added Scenes and Cinematic changes for the game, win and death screens
Added a score
Changed the way enemy spawns work
Removed unused scripts

Assets/Scripts/Other/TargetBillboardHelper.cs

@@ -0,0 +1,21 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class TargetBillboardHelper : MonoBehaviour
+{
+    // Start is called before the first frame update
+    void Start()
+    {
+        
+    }
+
+    // Update is called once per frame
+    void Update()
+    {
+        if (Camera.main != null)
+        {
+            gameObject.transform.rotation = Camera.main.transform.rotation;
+        }
+    }
+}