[PATCH V2 2/2] msxml3: Implement SAXContentHandler methods for DOMDocument mxwriter output.

[Jefferson Carpenter]

See commit message for differences from V1.

I'd like to send a smaller patch, but I feel like this functionality is 
pretty irreducible.  The method bodies all have to be modified by the 
time you add an alternate destination.


Didn't touch encoding property: "The encoding property has no effect for 
BSTR or DOM output" [1]


[1] 
https://docs.microsoft.com/en-us/previous-versions/windows/desktop/ms764660(v=vs.85)


thanks,
Jefferson