Structured edge detection & State-of-the-art image inpainting

adds class OCRHMMDecoder API interface and implementation and updates webcam_demo sample to use it

Conflicts:
	modules/ximgproc/CMakeLists.txt
	modules/ximgproc/test/test_main.cpp
	modules/ximgproc/test/test_precomp.hpp

refactors OCRTesseract interface

ADAS: multiple fixes, fcw_train and fcw_detect applications

update to new OpenCV 3.0 ml API and adds parallell_for_ OCR

ximgproc license

fixed ximgproc build on ARM

added xfeatures2d (made of opencv/nonfree and a part of opencv/features2d)

TLD