occt: add point wrapper to create, delete and get coordinates

src/occt/point.cpp

@@ -0,0 +1,17 @@
+#include <gp_Pnt.hxx>
+
+Point* make_point(double x, double y, double z) {
+    gp_Pnt* p = new gp_Pnt(x, y, z);
+    return reinterpret_cast<Point*>(p);
+}
+
+void free_point(Point* p) {
+    delete reinterpret_cast<gp_Pnt*>(p);
+}
+
+void coord_point(const Point* p, double* x, double* y, double* z) {
+    const gp_Pnt* gp = reinterpret_cast<const gp_Pnt*>(p);
+    *x = gp->X();
+    *y = gp->Y();
+    *z = gp->Z();
+}