G-API planar kernels (#14917)

* Added resizeP with tests

* NV12 planar filters

* fix warnings in ResizeP test

* fix out mat ocv warning

* sz_on - > sz rename

* cpu tests new signature

* try to fix resizeP test

* trailing spaces remove

* doxygen doc fixed

* doxygen minor fix

* more doxygen fixes

* Doxygen corrected and extended after review.

* onnx clip operation

G-API: Use object instead of reference in extended lifetime case (#14946)

* Use object instead of reference

* Make the object const

Merge pull request #14828 from armenpoghosov:parmen_RANSACPointSetRegistrator_getSubset_disaster_cleanup

Parmen ransac point set registrator get subset disaster cleanup (#14828)

* Avoid using v_signmask universal intrinsic and mark it as deprecated

* Renamed v_find_negative to v_scan_forward

Crosscorr cleanup (#14936)

* Simplify code for convolution destination type/size

For the 2d filter code, destination size equals source size, and the
crossCorr function even (re-)creates the output matrix with the given size.

The number of channels also have to match. The destination type() is the
one used to create the output matrix, so we can use its type() here.

This is a preparatory patch.
Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>

* Remove redundant destination size and type parameters from crossCorr

All calling sites of crossCorr already use (...,
mat, mat.size(), mat.type(), ...), so the parameters are redundant.
Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>

Due to the explicitly declared copy constructor Vec<T, n>::Vec(Vec <T,n>&)
GCC 9 warns if there is no assignment operator, as having one typically
requires the other (rule-of-three, constructor/desctructor/assginment).

As the values are just a plain array the default assignment operator does
the right thing. Tell the compiler explicitly to default it.
Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>