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Add a "scnosongcastsource" config option to disable adding the
"PL-to-Songcast" and "RD-to-Songcast" as sources to the SourceXML.

Needs to be set to "1" to activate the option.

Note, that setting this option will not allow you to use the Songcast
Tool in Upplay for the renderer, so you better know what you are doing.