load method
Load cascade classifier from a file.
For further details, please see: http://docs.opencv.org/master/d1/de5/classcv_1_1CascadeClassifier.html#a1a5884c8cc749422f9eb77c2471958bc
Implementation
bool load(String name) {
  final cname = name.toNativeUtf8().cast<ffi.Char>();
  final p = calloc<ffi.Int>();
  cvRun(() => cobjdetect.cv_CascadeClassifier_load(ref, cname, p));
  final rval = p.value != 0;
  calloc.free(p);
  calloc.free(cname);
  return rval;
}