try use new way to generate code

.gitignore

@@ -3,7 +3,6 @@
 *.cmo
 *.nms
 *.vmo
-CodeGen/dest/*.txt
 PyCmoOld/
 
 out/
@@ -11,6 +10,16 @@ temp/
 
 .vscode/
 
+## Special Treat of CodeGen
+CodeGen.old/
+CodeGen/dest/*.txt
+
+CodeGen/CKGeneralLexer*.*
+CodeGen/CKEnumParser*.*
+CodeGen/CKErrorParser*.*
+CodeGen/CKClassidParser*.*
+!CodeGen/*.g4
+
 ## Ignore Visual Studio temporary files, build results, and
 ## files generated by popular Visual Studio add-ons.
 ##