Fix symbolic linker errors (#804)

* fixed some issues with AccessViolationException errors that can happen sometimes

* handle a few exception types

Editor/Utilities/SymbolicLinks/SymbolicLinker.cs

@@ -453,23 +453,32 @@ private static bool VerifySymbolicLink(string targetAbsolutePath)
                 }
                 else
                 {
-                    var tempFile = $"{targetAbsolutePath}/temp_test.txt";
+                    var tempFile = $"{targetAbsolutePath}/symlink_temp.txt";
 
                     try
                     {
                         if (!File.Exists(tempFile))
                         {
-                            File.CreateText(tempFile).Dispose();
+                            var stream = File.CreateText(tempFile);
+                            stream.Dispose();
+                            stream.Close();
                         }
 
                         if (File.Exists(tempFile))
                         {
                             File.Delete(tempFile);
                         }
                     }
-                    catch (DirectoryNotFoundException)
+                    catch (Exception e)
                     {
-                        return false;
+                        switch (e)
+                        {
+                            case AccessViolationException _:
+                            case IOException _:
+                                return true;
+                            default:
+                                return false;
+                        }
                     }
                 }