[material graph]Make newline platform standard.

MaterialGraphProject/Assets/UnityShaderEditor/Runtime/Util/ShaderGenerator.cs

 using System.IO;
 using System.Linq;
 using System.Text;
+using System.Text.RegularExpressions;
 using UnityEngine.Graphing;
 
 namespace UnityEngine.MaterialGraph
                 template = template.Replace("${VertexShaderBody}", vertexShaderBody);
             }
 
-            return template;
+            return Regex.Replace(template, @"\r\n|\n\r|\n|\r", Environment.NewLine);
         }
 
         public static string GenerateSurfaceShader(PixelShaderNode node, MaterialOptions options, string shaderName, bool isPreview, out List<PropertyGenerator.TextureInfo> configuredTextures)
             }
 
             configuredTextures = shaderPropertiesVisitor.GetConfiguredTexutres();
-            return resultShader;
+
+            return Regex.Replace(resultShader, @"\r\n|\n\r|\n|\r", Environment.NewLine);
         }
 
         public int numberOfChunks