'dst' should be treated as an input arg (epilog not needed)

Also, removed the one from modules/python/src2/cv.py and cleared its
executable bit, since it's not a script.

* Drop some low level API
* Remove outdated overloads
* Utilize Input/OutputArray

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

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

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

Common part of all source files is extracted to special header

Based on pull request #31 (thanks to Eric Christiansen)
Support for Java is turned off by default and can be enabled setting
BUILD_opencv_java to ON (e.g. cmake -DBUILD_opencv_java=ON ..)