Image Quality Analysis (IQA) API (#1990)

* Implement Quality API

* Update README, fixes for gcc/tests

* Add license headers

* Update README

* Update README

* Case fixing, CMakeLists.txt update

* Update CV_EXPORTS_W

* Updates for compiler and doxygen warnings

* Updates for doxygen

* Updates based on feedback from @alalek

* Compliance updates

* case fixing

* case fixing

* OpenCL test fixes

* Case fixing

* Python fixes

* Python fixes

* Compliance updates

* Python binding fix

* Documentation updates

* Update README, fix cv::Scalar ops

* Updated precompiled headers for src cpp

* Removed internal a/b perf tests