Fix for system locales (#1593)

Fixed an issue that color property and vector in blackboard could still cause a system locale error.

com.unity.shadergraph/CHANGELOG.md

 - Shader graphs using alpha clip now generate correct depth and shadow passes.
 - `Normal Create` node has been renamed to `Normal From Texture`.
 - The preview of nodes now updates correctly.
+- Your system locale can no longer cause incorrect commands due to full stops being converted to commas.

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

             result.Append("(\"");
             result.Append(displayName);
             result.Append("\", Color) = (");
-            result.Append(value.r);
+            result.Append(NodeUtils.FloatToShaderValue(value.r));
-            result.Append(value.g);
+            result.Append(NodeUtils.FloatToShaderValue(value.g));
-            result.Append(value.b);
+            result.Append(NodeUtils.FloatToShaderValue(value.b));
-            result.Append(value.a);
+            result.Append(NodeUtils.FloatToShaderValue(value.a));
             result.Append(")");
             return result.ToString();
         }

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

 using System;
 using System.Text;
+using UnityEditor.Graphing;
 using UnityEngine;
 
 namespace UnityEditor.ShaderGraph
             result.Append("(\"");
             result.Append(displayName);
             result.Append("\", Vector) = (");
-            result.Append(value.x);
+            result.Append(NodeUtils.FloatToShaderValue(value.x));
-            result.Append(value.y);
+            result.Append(NodeUtils.FloatToShaderValue(value.y));
-            result.Append(value.z);
+            result.Append(NodeUtils.FloatToShaderValue(value.z));
-            result.Append(value.w);
+            result.Append(NodeUtils.FloatToShaderValue(value.w));
             result.Append(")");
             return result.ToString();
         }