Music implementation, cloud art, and bug fixes

Implemented music
Added cloud tiles
Made players be able to stand on each others' heads
Synced the music and day/night cycle
Added a transition in to the gameplay scene
Fixed blocking while dying bug

Assets/Scripts/PlayerManager.cs

@@ -1,3 +1,4 @@
+using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.InputSystem;