Adopt XS containers everywhere (incomplete work)

xs/xsp/Polygon.xsp

@@ -34,5 +34,14 @@ Polygon::new(...)
     OUTPUT:
         RETVAL
 
+void
+Polygon::rotate(angle, center_sv)
+    double  angle;
+    SV*     center_sv;
+    CODE:
+        Point center;
+        center.from_SV_check(center_sv);
+        THIS->rotate(angle, &center);
+
 %}
 };