Cleanup core module API

* Drop some low level API
* Remove outdated overloads
* Utilize Input/OutputArray
Update documentation
Move border type constants and Moments class to core module
Move borderInterpolate and copyMakeBorder documentation
Merge pull request #791 from taka-no-me:cleanup_core_api
Merge pull request #795 from taka-no-me:move_imgproc_utils_to_core