Added macros MAP_UD, MAP_LIST_UD, MAP_UD_I, MAP_LIST_UD_I. #6
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These macros allow the user to pass a single value to all invocations of the user macro (as proposed in the this StackOverflow comment and the *_I variants additionally pass the index of the invocation as an integer literal (thereby solving issue #5). This requires a list of predefined increment operations. Updated the documentation accordingly. I also took the liberty to add a link to my own serialization library which uses the map macro as well.