Added new stocking scope to shader gui;

Added new stocking surface feature;
Added unity 6.3 support;

Fixed the issue that ssr weight does not blend ibl and ssr properly;
Fixed the issue that material recive ssr regardless of specular ambient mode;

Editor/MeterialEditor/UIScopes/ShadowScope.cs

@@ -30,7 +30,7 @@ namespace Misaki.HdrpToon.Editor
 
         protected override GUIContent Header => EditorGUIUtility.TrTextContent("Shadow Settings");
 
-        public override void LoadMaterialProperties()
+        protected override void LoadMaterialProperties()
         {
             Properties.receiveLightShadow = FindProperty("_Receive_Light_Shadow");
             Properties.receiveScreenSpaceShadow = FindProperty("_Receive_Screen_Space_Shadow");