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
Added ocl::pyrDown to T-API
Added ocl::pyrUp to T-API
Merge pull request #1950 from GregoryMorse:patch-2
Merge pull request #1995 from akarsakov:ocl_pyramids
added cv::mulSpectrums to T-API
Merge pull request #2032 from ilya-lavrenov:tapi_mulSpectrums