* 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

- #if 0
- #ifdef __OPENCV_BUILD

- required to unregister callbacks from system

* Support nGraph

* Fix resize

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

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.

- apply tag 'skip_other'

ml: refactored tests

* use parametrized tests where appropriate
* use stable theRNG in most tests
* use modern style with EXPECT_/ASSERT_ checks

- DEBUG logging compilation is enabled for all videoio backends
- eliminate output through perror(), stderr

* Fix infinite loop when trying to change state of the busy camera

  - Add finite number of attempts in tryIoctl functions
    10 by default.

* Introduced new flag for ioctl call to handle EBUSY