- trackbar handle width and height as parameters

[lukadt]

I am using cvui in a touch device with a full hd resolution and being able to define trackbar handles is useful.

[Dovyski]

Awesome, thank you!

In order to keep backward compatibility, would it be possible for you to move the theHandleWidth and theHandleHeight params to the end of the arguments list, please?

E.g.

bool trackbar(
  cv::Mat& theWhere,
  int theX,
  int theY,
  int theWidth,
  T *theValue,
  T theMin,
  T theMax,
  int theSegments = 1,
  const char *theLabelFormat = "%.1Lf",
  unsigned int theOptions = 0,
  T theDiscreteStep = 1,
  int theHandleWidth  =3,
  int theHandleHeight = 4);