- Now user doesn't need to do `combine(x, combine(y, combine(z, zz)))` but
  just `combine(x, y, z, zz)`

* calib3d: use normalized input in solvePnPGeneric()

* calib3d: java regression test for solvePnPGeneric

* calib3d: python regression test for solvePnPGeneric

* core: disable invalid constructors in C API by default

- C API objects will lose their default initializers through constructors

* samples: stop using of C API

Fix cudacodec python

* Add python bindings to cudacodec.

* Allow args with CV_OUT GpuMat& or CV_OUT cuda::GpuMat& to generate python bindings that allow the argument to be an optional output in the same way as OutputArray.

* Add wrapper flag to indicate that an OutputArray is a GpuMat.

* python: drop CV_GPU, extra checks in test

* Remove "cuda::GpuMat" check rom python parser

- #if 0
- #ifdef __OPENCV_BUILD

- required to unregister callbacks from system

G-API-NG/Streaming: don't require explicit metadata in compileStreaming()

* First probably working version
Hardcode gose to setSource() :)

* Pre final version of move metadata declaration from compileStreaming() to setSource().

* G-API-NG/Streaming: recovered the existing Streaming functionality

- The auto-meta test is disabling since it crashes.
- Restored .gitignore

* G-API-NG/Streaming: Made the meta-less compileStreaming() work

- Works fine even with OpenCV backend;
- Fluid doesn't support such kind of compilation so far - to be fixed

* G-API-NG/Streaming: Fix Fluid to support meta-less compilation

- Introduced a notion of metadata-sensitive passes and slightly
  refactored GCompiler and GFluidBackend to support that
- Fixed a TwoVideoSourcesFail test on streaming

* Add three smoke streaming tests to gapi_streaming_tests.
All three teste run pipeline with two different input sets
1) SmokeTest_Two_Const_Mats test run pipeline with two const Mats
2) SmokeTest_One_Video_One_Const_Scalar test run pipleline with Mat(video source) and const Scalar
3) SmokeTest_One_Video_One_Const_Vector test run pipeline with Mat(video source) and const Vector
 # Please enter the commit message for your changes. Lines starting

* style fix

* Some review stuff

* Some review stuff

* Support nGraph

* Fix resize

  - add reference to Rodrigues Jacobian
  - add references to SE(3) and Lie Groups topics
  - update some conventions and pinhole figure

* Added Swish and Mish activations

* Fixed whitespace errors

* Kernel implementation done

* Added function for launching kernel

* Changed type of 1.0

* Attempt to add test for Swish and Mish

* Resolving type mismatch for log

* exp from device

* Use log1pexp instead of adding 1

* Added openCL kernels

(1/4) Revert "Correct image borders and principal point computation in cv::stereoRectify"

This reverts commit 93ff1fb2.

(2/4) Revert "fix calib3d changes in 6836 plus some others"

This reverts commit fa42a1cf.

(3/4) Revert "fix compiler warning"

This reverts commit b3d55489.

(4/4) Revert "add test for 6836"

This reverts commit d06b8c4e.

Tests for argument conversion of Python bindings generator

* Tests for parsing elemental types from Python bindings

  - Add positive and negative tests for int, float, double, size_t,
    const char*, bool.
  - Tests with wrong conversion behavior are skipped.

* Move implicit conversion of bool to integer/floating types to wrong
conversion behavior.

Fix incorrect use of std::move() in g-api perf tests

* First version

* Fix perfomace tests

Replace

    c.apply(...);

with

    cc = c.compile(...);
    cc(...);

* Remove output meta arguments from .compile()

* Style fix

* Remove useless commented string

* Stick to common pattern : i.e. use gin() and gout() explicitly.

* Use cc(gin(...), gout(...)) in all cases.