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/OutlineScope.cs

@@ -48,7 +48,7 @@ namespace Misaki.HdrpToon.Editor
 
         protected override GUIContent Header => EditorGUIUtility.TrTextContent("Outline Settings");
 
-        public override void LoadMaterialProperties()
+        protected override void LoadMaterialProperties()
         {
             Properties.outlineState = FindProperty(OUTLINE_STATE);