Adds Edge-Preserving Filter (#1690)

* Module EPF - Edge-Preserving Filter added

* Changed name from template to epf

* Removed clang-format file

* Added header Files. Eliminated showWindow function. Used CommandLineParser.

* Moved filter from epf module to ximgproc

* Removed header files from sample

* Minor bug fix in demo. Pointers in demo removed.

* Pointers removed. InputArray/OutputArray added

* License header added

* License header from sample file removed

* Unit test for performance added

* Replaced manual mean computation with cv::mean

* Beautified code via clang-format and https://raw.githubusercontent.com/opencv/opencv_contrib/master/modules/cvv/.clang-format

* Merged historic if... else if statement into one if statement

* Trailing whitespace removed and .. changed into .

* Tabs replaced with 4 spaces.

* Removed subwindow = src(roi);

* Moved type test to beginning of code

* Removed indentation from namespace and added //! @}

* Added name to header

* git cleanup introduced some errors fixed here

* Changed path testdata/perf/320x260.png to perf/320x260.png

* Fixed warning declaration of 'subwindow1' hides previous local declaration

* Fixed warning 'const' qualifier on reference type 'cv::InputArray' (aka 'const cv::_InputArray &') has no effect

* Accuracy test added/

* Renamed void edgepreservingFilter to void edgePreservingFilter

* run length morphology

* remove unused code, avoid warnings for undefined functions

* handle empty input in getBoundingRectangle correctly, remove unused operations

* changes according to code review

* fix #1665 ChAruco board topology (nearestMarkerIdx) is sensitive to scale

* Some bugs in deriche and paillou filter

* Cv_Assert to CV_CheckType

enables an ordered chain of full-screen post processing effects

In some case, Discrete Fourier Transform in computeSaliencyImpl() returns
magnitude matrix which contains zero values.
Then, log() returns -inf values and normalization with blur() returns -nan.
When computeBinaryMap() is called double free or corruption exception occurs
because kmeans() fails to compute distance.
Signed-off-by: d.bouron <d.bouron@criteo.com>

* update structured_edge_detection 

update structured_edge_detection to read models from updated p. dollar toolbox

* Update structured_edge_detection.cpp

* Update structured_edge_detection.cpp

casting size_t to int

for this
- move Params struct out of class
- use static create instead of pimpl
- allow demo to be compiled without VIZ

* KinFu demo: added support for live demo, some bugs fixed

* minor fixes

* Kinect2 workarounds and defaults added