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

* Fix android armv7 c++_static init crash

* core: move initialization of 'ios_base::Init' for Android

- do not require extensions library

Improving VSX performance of integral function

* Adding support for vector get function on VSX datatypes so the
integral function gains a bit of performance.

* Removing get as a datatype member function and implementing a new HAL
instruction v_extract_n to get the n-th element of a vector register.

* Adding SSE/NEON/AVX intrinsics.

* Implement new HAL instruction v_broadcast_element on VSX/AVX/NEON/SSE.

* core(simd): add tests for v_extract_n/v_broadcast_element

- updated docs
- commented out code to repair compilation
- added WASM and MSA default implementations

* core(simd): fix compilation

- x86: avoid _mm256_extract_epi64/32/16/8 with MSVS 2015
- x86: _mm_extract_epi64 is 64-bit only

* cleanup

core(test): extending tests with SIMD C++ emulation code (intrin_cpp.hpp)

* core(test): test SIMD CPP emulation code (intrin_cpp.hpp)

* core(simd): eliminate build warnings from intrin_cpp.hpp