Refactor Streaming with new settings and textures streaming configuration

Source/Engine/Streaming/StreamingSettings.h

@@ -0,0 +1,32 @@
+// Copyright (c) 2012-2021 Wojciech Figat. All rights reserved.
+
+#pragma once
+
+#include "Engine/Core/Config/Settings.h"
+#include "TextureGroup.h"
+
+/// <summary>
+/// Content streaming settings.
+/// </summary>
+API_CLASS(sealed, Namespace="FlaxEditor.Content.Settings", NoConstructor) class FLAXENGINE_API StreamingSettings : public SettingsBase
+{
+DECLARE_SCRIPTING_TYPE_MINIMAL(StreamingSettings);
+public:
+
+    /// <summary>
+    /// Textures streaming configuration (per-group).
+    /// </summary>
+    API_FIELD(Attributes="EditorOrder(100), EditorDisplay(\"Textures\")")
+    Array<TextureGroup, InlinedAllocation<32>> TextureGroups;
+
+public:
+
+    /// <summary>
+    /// Gets the instance of the settings asset (default value if missing). Object returned by this method is always loaded with valid data to use.
+    /// </summary>
+    static StreamingSettings* Get();
+
+    // [SettingsBase]
+    void Apply() override;
+    void Deserialize(DeserializeStream& stream, ISerializeModifier* modifier) final override;
+};