Initialize managers during `BeforeSceneLoad` both in editor and runtime (#30)

* Managers are now initialized during `BeforeSceneLoad` both in editor and runtime

* Updated Changelog

* Fix changelog

CHANGELOG.md

 
 * Added generic `bool Manager.TryGet<T>(out T manager)`
 
+#### Fixed
+
+* **BEHAVIOR CHANGE/FIX** : Managers are now initialized during `BeforeSceneLoad` both in editor and runtime to prevent behavior discrepancies and rare `Resource.Load<>()` issues. 
+
 ## 2020.2.1
 
 #### Fixed

Runtime/Managers/Manager.cs

 
         static readonly Type[] kAllManagerTypes = GetAllManagerTypes();
 
-#if UNITY_EDITOR
-        [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.SubsystemRegistration)]
-#else
-        [RuntimeInitializeOnLoadMethod]
-#endif
+        [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.BeforeSceneLoad)]
         static void AutoCreateAll()
         {
             s_Managers.Clear();