Add tasks for all the new languages

Task/XML-Output/Sidef/xml-output.sidef

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+require('XML::Mini::Document');
+
+var students = [
+                ["April",         "Bubbly: I'm > Tam and <= Emily"],
+                ["Tam O'Shanter", "Burns: \"When chapman billies leave the street ...\""],
+                ["Emily",         "Short & shrift"]
+               ];
+
+var doc   = %s'XML::Mini::Document'.new;
+var root  = doc.getRoot;
+var studs = root.createChild("CharacterRemarks");
+
+students.each { |s|
+    var stud = studs.createChild("Character");
+    stud.attribute("name", s[0]);
+    stud.text(s[1]);
+};
+
+print doc.toString;