Implementation of the Match porcelain interface for OF version 1.3:
1. Renamed ENUM values in MatchFields to conform with the OF spec to allow unified code generation.
2. Extended OFOxms factory with methods for creating OXM objects from a given field and value. This code is automatically generated from the oxm_map in java_model.
3. Implemented OFMatchV3Ver13.java custom template.
4. Implemented OFMatchV3Ver13.Builder.java custom template.

Tested new implementation on demo controller and it works.
diff --git a/java_gen/templates/of_class.java b/java_gen/templates/of_class.java
index bcaf961..4ea6ac9 100644
--- a/java_gen/templates/of_class.java
+++ b/java_gen/templates/of_class.java
@@ -106,7 +106,7 @@
                     );
         }
         //:: if os.path.exists("%s/custom/%s.Builder.java" % (template_dir, msg.name)):
-        //:: include("custom/%s.Builder.java" % msg.name, msg=msg)
+        //:: include("custom/%s.Builder.java" % msg.name, msg=msg, has_parent=True)
         //:: #endif
 
     }
@@ -129,7 +129,7 @@
                 );
         }
         //:: if os.path.exists("%s/custom/%s.Builder.java" % (template_dir, msg.name)):
-        //:: include("custom/%s.Builder.java" % msg.name, msg=msg)
+        //:: include("custom/%s.Builder.java" % msg.name, msg=msg, has_parent=False)
         //:: #endif
 
     }