Added pause capability to all levels, added music to Level 5, added a simple chasing AI to the glowing ghosts, and optimized the Main Menu scene

Main.gd

@@ -43,8 +43,6 @@ func main_menu_option(option: String) -> void:
         yield(level_select_menu, 'complete')
         free_connected_node(level_select_menu, 'level_select_menu_option')
         level_select_menu = null
-    elif option == 'quit':
-        quit_game()
     return
 
 
@@ -80,8 +78,3 @@ func new_game(level: String) -> void:
         print('ERROR: Main failed to change scene to Level.')
     queue_free()
     return
-
-
-func quit_game() -> void:
-    get_tree().quit()
-    return