libtinyxml2: new package

TinyXML-2 is a rewrite of TinyXML-1. It provides some advantages over the original. They are covered on the homepage. (http://www.grinninglizard.com/tinyxml2/

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Signed-off-by: A. Varnin <fenixk19@mail.ru>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>