1. Use macro defines for some parameters(radius).
2. Reduce local memory usage.
3. Fix accuracy problem on Intel GPU.

Also cv::, cv::gpu:: and cv::ocl:: namespace prefixes can be safely omitted
inside CV_ENUM and CV_FLAGS

RadiusMatch for HammingDist cannot pass yet.

OpenCL StereoBeliefPropagation, ported from GPU implementation.

Add CL_CPU to supportsFeature check
simplify the logic of pyrlk

Currently the function only supports wavefront size query