[WIP] Bezier implementation

typed-geometry @ d84ac044

-Subproject commit dea8ed6fec9b9037101b4872c00ea41da65d6ffd
+Subproject commit d84ac044df768b4dc9e520733c94c9b77c913680

tests/bezier.cc

@@ -14,6 +14,13 @@ TEST_CASE("TypedGeometry.Bezier")
 
     tg::bezier<2, tg::pos2> c0 = {tg::pos2{1, 2}, tg::pos2{2, 3}, tg::pos2{3, 4}};
 
+    auto const pair = split_at(c0, 0.6f);
+    std::cout << pair.first(1.0f) << std::endl;
+    std::cout << pair.second(0.0f) << std::endl;
+
+    auto const nf = tangent_f(c0);
+    std::cout << nf(1) << std::endl;
+
     std::cout << c0[0.0f] << std::endl;
 
     tg::bezier<3, tg::pos2> c;