Remove pass-specific methods from PassBuilder and move them as extension methods to the rename passes.

src/Generator/PassBuilder.cs

@@ -25,29 +25,5 @@ namespace Cxxi
             pass.Library = Library;
             Passes.Add(pass);
         }
-
-        #region Operation Helpers
-
-        public void RenameWithPattern(string pattern, string replacement, RenameTargets targets)
-        {
-            AddPass(new RegexRenamePass(pattern, replacement, targets));
-        }
-
-        public void RemovePrefix(string prefix)
-        {
-            AddPass(new RegexRenamePass("^" + prefix, String.Empty));
-        }
-
-        public void RemovePrefixEnumItem(string prefix)
-        {
-            AddPass(new RegexRenamePass("^" + prefix, String.Empty, RenameTargets.EnumItem));
-        }
-
-        public void RenameDeclsCase(RenameTargets targets, RenameCasePattern pattern)
-        {
-            AddPass(new CaseRenamePass(targets, pattern));
-        }
-
-        #endregion
     }
 }

src/Generator/Passes/RenamePass.cs

@@ -221,4 +221,30 @@ namespace Cxxi.Passes
             return sb.ToString();
         }
     }
+
+    public static class RenamePassExtensions
+    {
+        public static void RenameWithPattern(this PassBuilder builder,
+            string pattern, string replacement, RenameTargets targets)
+        {
+            builder.AddPass(new RegexRenamePass(pattern, replacement, targets));
+        }
+
+        public static void RemovePrefix(this PassBuilder builder, string prefix)
+        {
+            builder.AddPass(new RegexRenamePass("^" + prefix, String.Empty));
+        }
+
+        public static void RemovePrefixEnumItem(this PassBuilder builder, string prefix)
+        {
+            builder.AddPass(new RegexRenamePass("^" + prefix, String.Empty,
+                RenameTargets.EnumItem));
+        }
+
+        public static void RenameDeclsCase(this PassBuilder builder, 
+            RenameTargets targets, RenameCasePattern pattern)
+        {
+            builder.AddPass(new CaseRenamePass(targets, pattern));
+        }
+    }
 }