Add lobby and scene managers, implement scene switching with fade in/out

Assets/Scripts/Managers/SceneManager.cs

@@ -0,0 +1,60 @@
+using HurricaneVR.Framework.Core.Player;
+using Sirenix.OdinInspector;
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.SceneManagement;
+using Zenject;
+
+public class SceneManager : MonoBehaviour
+{
+    enum Scene
+    {
+        Lobby = 0,
+        Entrance = 1,
+        Forge = 2
+    }
+
+    [Inject]
+    [ReadOnly]
+    [SerializeField]
+    private HVRPlayerController playerController;
+
+    [ReadOnly]
+    [SerializeField]
+    private float fadeDuration = 2f;
+
+    [ReadOnly]
+    [SerializeField]
+    private Scene scene;
+
+    [Button]
+    public void SwitchToEntranceLevel()
+    {
+        StartCoroutine(SwitchToScene(Scene.Entrance));
+    }
+
+    private IEnumerator SwitchToScene(Scene scene)
+    {
+        playerController.ScreenFader.Fade(1, fadeDuration);
+
+        var operation = UnityEngine.SceneManagement.SceneManager
+            .LoadSceneAsync((int)scene);
+
+        operation.allowSceneActivation = false;
+        
+        float timer = 0;
+
+        while (timer <= fadeDuration && !operation.isDone)
+        {
+            timer += Time.deltaTime;
+            yield return null;
+        }
+
+        operation.allowSceneActivation = true;
+
+        this.scene = scene;
+
+        playerController.ScreenFader.Fade(0, fadeDuration);
+    }
+}