added old=>new cascade conversion function
Update system.cpp

Cleaned up to use the preferred namespace code.  This can be further simplified by using the HString/HStringReference classes from wrl\wrappers\corewrappers.h
converted Haar cascades to the new format; now they are handled with C++ code.
continue adding OpenCL optimization to cascade classifier
umat: fix memory leaks
almost finished opencl-ization of cascade classifier
trying to debug the new cascade
fixed UMat::copyTo(UMat)
it finally works!!!
Merge pull request #2004 from ilya-lavrenov:tapi_umat_copyto
Merge pull request #1997 from alalek:tapi_fix_memleaks
adding LICENSE file and a sample of its reference in ocl.hpp
Merge pull request #2000 from apavlenko:license_copyright
added cv::dft T-API test
Added ocl::pyrDown to T-API
some attempts to tune the performance
added cv::repeat to T-API
renamed OpenCL kernel filename; made some final changes
converted old haar cascades to the new format; added the conversion function; added OpenCL optimization into CascadeClassfier; optimized the data structures and CPU code for the stump case.
fixed various warnings from the “doc” and other builders