Winding number and distances to Bézier splines (#2527)

* roots, cubics, tests and tutorial

* Orientation to igl::, point_in_convex_hull, eyt_winding_number with func handle, fix bug in eyt_sdf, tutorial, tests

* working spline winding number and demo

* doc

* better cm

tutorial/1003_WindingNumber2D/main.cpp

@@ -118,7 +118,7 @@ int main(int argc, char * argv[])
         };
         if(quantity == UNSIGNED_DISTANCE || quantity == SIGNED_DISTANCE)
         {
-          igl::eytzinger_aabb_sdf(p,primitive_p,B1,B2,leaf,di);
+          igl::eytzinger_aabb_sdf<false>(p,primitive_p,B1,B2,leaf,di);
         }
         if(quantity == WINDING_NUMBER || quantity == SIGNED_DISTANCE)
         {