[PRINTING] Replace all my custom marshalling code by calls to the newly implemented APIs, thereby significantly reducing the codebase and providing a sane template to implement more Printing APIs.

[PRINTING] Implement the undocumented MarshallDownStructure, MarshallDownStructuresArray, MarshallUpStructure, and MarshallUpStructuresArray to the extent I need and could find out through black-box

[PRINTING] Implement the undocumented MarshallDownStructure, MarshallDownStructuresArray, MarshallUpStructure, and MarshallUpStructuresArray to the extent I need and could find out through black-box testing.

PDBs reveal that these functions are also used in winspool.drv, but not imported from spoolss.dll to retain the client/server architecture.
As winspool.drv highly benefits from the MarshallUp* functions, I put them in a source file shared between spoolss.dll and winspool.drv.

The added API Tests cover my testing and all implemented features.
One more item done from https://reactos.org/wiki/Printing !

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