Refactor XMLGenerator

[indocomsoft]

[martin-henz]

@indocomsoft can you explain in what way it needs to be refactored?

[indocomsoft]

Refactoring using macros, cos right now I have to keep on creating new functions for each tag. Instead the block could be passed to a macro that will automatically convert each function to a new tag.

This is strictly very low priority, cos its only used for testing the xml parser.

[martin-henz]

OK, will keep it around as "_postponed".

[jiachen247]

I can work on this since im gonna be touching on the xml_parser!! will refractor accordingly.