Conflicts:
	modules/core/include/opencv2/core/cuda.hpp
	modules/cudacodec/src/thread.cpp
	modules/cudacodec/src/thread.hpp
	modules/superres/perf/perf_superres.cpp
	modules/superres/src/btv_l1_cuda.cpp
	modules/superres/src/optical_flow.cpp
	modules/videostab/src/global_motion.cpp
	modules/videostab/src/inpainting.cpp
	samples/cpp/stitching_detailed.cpp
	samples/cpp/videostab.cpp
	samples/gpu/stereo_multi.cpp

Also changed the static functions to inline, to stop GCC complaining
about unused functions.

Consider this a part of merging #1357.

cudev is used for new device layer

it uses HAVE_CUDA, HAVE_NVCUVID, etc. macroses

used new CV_PERF_TEST_MAIN_WITH_IMPLS mechanism

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

Memory leak in BoostedSoftCascadeOctave::traverse