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
almost finished opencl-ization of cascade classifier
trying to debug the new cascade
it finally works!!!
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
Merge pull request #2018 from ilya-lavrenov:tapi_dft
2 more fixes to calm down the doc builder
Added ocl::pyrUp to T-API
Merge pull request #2019 from ilya-lavrenov:tapi_repeat
Merge pull request #2021 from vpisarev:ocl_facedetect7
imgproc: IPP compilation fix and minor cleanup