e.g. <opencv2/core/core.hpp> become <opencv2/core.hpp>

Also renamed <opencv2/core/opengl_interop.hpp> to <opencv2/core/opengl.hpp>

- added CMake toolchain file
- added WITH_NVCUVID flag

- fixed printCudaDeviceInfo for new CC
- fixed some compilation errors and warnings
- removed unset command from CMake script
- removed unused std imports

 - exclude system paths from library search paths
 - remove hardcoded paths to compiler
 - enable compiling with 3d-parties
 - enable build as shared libraries

* added CMake toolchain file
* added WITH_NVCUVID flag

This reverts commit 889674ef.

Suppressed hundreds of useless MSVC warnings (can be reenabled setting cmake variable ENABLE_NOISY_WARNINGS to ON). Fixed some of remaining warnings.

added PyrLKOpticalFlowDense performance test