XamlParser: avoid ArgumentException with the dictionary
XamlParser: avoid ArgumentException with the dictionary

To avoid ArgumentExceptions "element with the same key already exists", this replaces the Dictionary<string, Stream> by a List<Tuple<string, Stream>>

rdio/vernacular,benoitjadinon/vernacular,gabornemeth/vernacular,dsuess/vernacular,StephaneDelcroix/vernacular,rdio/vernacular,mightea/vernacular,mightea/vernacular,benoitjadinon/vernacular,dsuess/vernacular,gabornemeth/vernacular,StephaneDelcroix/vernacular