Add 16-bit image support for edge detection class

[ihhub]

We have edge detection code located in src/edge_detection.h and src/edge_detection.cpp files. We would like to add a support of Image16Bit class which is 16-bit unsigned integer based image. Steps are needed to be done:

1. Modify this function

    template <typename _Type>
    void findEdgePoints( const penguinV::Image & image, uint32_t x, uint32_t y, uint32_t width, uint32_t height, const EdgeParameter & edgeParameter,
                         std::vector < PointBase2D<_Type> > & positiveEdgePoint, std::vector < PointBase2D<_Type> > & negativeEdgePoint )

To work with any type of images. It means replace penguinV::Image by penguinV::ImageTemplate<_ImageType> and make further modifications of the code inside the function.

2. Add needed overloaded instances of find functions in EdgeDetectionHelper class only for new type of the image
3. Add needed overloaded instances of find functions in EdgeDetectionBase class only for new type of the image
4. Modify test/unit_tests/unit_test_edge_detection.cpp functions to accept any type of images.