Rename AnimationManager to Animations and expose to public

Source/Engine/Animations/Animations.h

@@ -0,0 +1,25 @@
+// Copyright (c) 2012-2021 Wojciech Figat. All rights reserved.
+
+#pragma once
+
+class AnimatedModel;
+
+/// <summary>
+/// The animations service.
+/// </summary>
+class FLAXENGINE_API Animations
+{
+public:
+
+    /// <summary>
+    /// Adds an animated model to update.
+    /// </summary>
+    /// <param name="obj">The object.</param>
+    static void AddToUpdate(AnimatedModel* obj);
+
+    /// <summary>
+    /// Removes the animated model from update.
+    /// </summary>
+    /// <param name="obj">The object.</param>
+    static void RemoveFromUpdate(AnimatedModel* obj);
+};