Make bound input types have a default slot label that identifies the space of the default input

com.unity.shadergraph/Editor/Data/Graphs/BitangentMaterialSlot.cs

 using System;
+using UnityEditor.ShaderGraph.Drawing.Slots;
+using UnityEngine.Experimental.UIElements;
 
 namespace UnityEditor.ShaderGraph
 {
                                      ShaderStage shaderStage = ShaderStage.Dynamic, bool hidden = false)
             : base(slotId, displayName, shaderOutputName, space, shaderStage, hidden)
         {}
+
+        public override VisualElement InstantiateControl()
+        {
+            return new BoundInputVectorControlView(space + " Space");
+        }
 
         public override string GetDefaultValue(GenerationMode generationMode)
         {

com.unity.shadergraph/Editor/Data/Graphs/NormalMaterialSlot.cs

 using System;
-using UnityEngine;
+using UnityEditor.ShaderGraph.Drawing.Slots;
+using UnityEngine.Experimental.UIElements;
 
 namespace UnityEditor.ShaderGraph
 {
                                   ShaderStage shaderStage = ShaderStage.Dynamic, bool hidden = false)
             : base(slotId, displayName, shaderOutputName, space, shaderStage, hidden)
         {}
+
+        public override VisualElement InstantiateControl()
+        {
+            return new BoundInputVectorControlView(space + " Space");
+        }
 
         public override string GetDefaultValue(GenerationMode generationMode)
         {

com.unity.shadergraph/Editor/Data/Graphs/PositionMaterialSlot.cs

 using System;
-using UnityEngine;
+using UnityEditor.ShaderGraph.Drawing.Slots;
+using UnityEngine.Experimental.UIElements;
 
 namespace UnityEditor.ShaderGraph
 {
                                     ShaderStage shaderStage = ShaderStage.Dynamic, bool hidden = false)
             : base(slotId, displayName, shaderOutputName, space, shaderStage, hidden)
         {}
+
+        public override VisualElement InstantiateControl()
+        {
+            return new BoundInputVectorControlView(space + " Space");
+        }
 
         public override string GetDefaultValue(GenerationMode generationMode)
         {

com.unity.shadergraph/Editor/Data/Graphs/TangentMaterialSlot.cs

 using System;
-using UnityEngine;
+using UnityEditor.ShaderGraph.Drawing.Slots;
+using UnityEngine.Experimental.UIElements;
 
 namespace UnityEditor.ShaderGraph
 {
                                    ShaderStage shaderStage = ShaderStage.Dynamic, bool hidden = false)
             : base(slotId, displayName, shaderOutputName, space, shaderStage, hidden)
         {}
+
+        public override VisualElement InstantiateControl()
+        {
+            return new BoundInputVectorControlView(space + " Space");
+        }
 
         public override string GetDefaultValue(GenerationMode generationMode)
         {

com.unity.shadergraph/Editor/Data/Graphs/ViewDirectionMaterialSlot.cs

 using System;
-using UnityEngine;
+using UnityEditor.ShaderGraph.Drawing.Slots;
+using UnityEngine.Experimental.UIElements;
 
 namespace UnityEditor.ShaderGraph
 {
                                          ShaderStage shaderStage = ShaderStage.Dynamic, bool hidden = false)
             : base(slotId, displayName, shaderOutputName, space, shaderStage, hidden)
         {}
+        public override VisualElement InstantiateControl()
+        {
+            return new BoundInputVectorControlView(space + " Space");
+        }
 
         public override string GetDefaultValue(GenerationMode generationMode)
         {

com.unity.shadergraph/Editor/Resources/Styles/Controls/BoundInputVectorSlotControlView.uss

-ScreenPositionSlotControlView > Label {
-    margin-top: 0;
-    margin-bottom: 0;
-    margin-left: 0;
-    margin-right: 0;
-    width: 54;
-}
+BoundInputVectorControlView > Label {
+}