Enable "useProvidedKeypoints" flag on cuda::ORB's detectAndCompute function in order to able to describe provided keypoints.

* additional author : Ender Tunç <endertunc@yahoo.com>

resolves #6473

 * Enable "useProvidedKeypoints" flag on cuda::ORB's detectAndCompute function in order to able to describe provided keypoints.

   Update for using 'const' reference to avoid array copy on each iteration.

resolves #6473

	Update for 'const' reference to avoid array copy on each iteration.

use new abstract interface and hidden implementation

use new FastFeatureDetector abstract interface and hidden implementation

cudev is used for new device layer

This reverts commit fba72cb6, reversing
changes made to 02131ffb.

Made all STL usages explicit to be able automatically find all usages of
particular class or function.

ORB_GPU::downloadKeyPoints
ORB_GPU::convertKeyPoints

added getParams method to VideoWriter_GPU

lot's of changes; nonfree & photo modules added; SIFT & SURF -> nonfree module; Inpainting -> photo; refactored features2d (ORB is still failing tests), optimized brute-force matcher and made it non-template.

removed void integral(const GpuMat& src, GpuMat& sum, GpuMat& sqsum, Stream& stream) - it fails with NPP_NOT_IMPLEMENTED error
updated docs, accuracy and performance tests

minor build system changes (now cuda code in opencv_core is compiled using CUDA_ARCH* cmake variables)