* Haiku supporting patches

* Revert uneeded changes

* Whitespace cleanup

Bug was added in f6ceeaa2 commit, different angle computation functions have different parameter order.

Fixed dynamic build script for iOS (#10923)

* Readded UIDeviceFamily (was removed in beec247)

* Added correct bitcode flag to python build script for iOS

* Missed the bitcodedisabled check

* Corrected the syntax in my proposed changes

  * add ifdef to apply on specific situation

* Fix #10948

* Add test code

* Fixed build error

* Add value zero

* eigen: test cleanup

Refactor decolor (#11035)

* decolor: modernize deprecated headers (math.h -> cmath)

* refactor contrast_preserve.cpp

* refactor contrast_preserve.hpp (add static/const)

* refactor contrast_preserve.hpp (join assignment and declaration)

* refactor contrast_preserve.hpp (format)

* refactor test_decolor.cpp (indent)

* refactor contrast_preserve.hpp (const)

* contrast_preserve.hpp : optimize by minMaxLoc

* fix trailing-whitespace

* fix warning C4267 on VC++ x64
(conversion from 'size_t' to 'int', possible loss of data)

* use cvRound instead of round_num

* decrease indentation of test_decolor.cpp

* remove pow() to optimize

* remove redundant Mat initialization

Enabling build of visualization module when using VTK 9 (current HEAD of d5bbb9e99bbc6d11d2196c48bfd8f33508554551)

Without proposed change, module throws build error regarding missing `opencv2/cudaimgproc.hpp`

This suppresses the interpretation of string literals by switching the ocv_download_log from a macro to a function.
This avoid crashes when the string to log contains escape characters.

More details about the problem this PR fixes are available at: https://github.com/opencv/opencv_contrib/issues/1131

* optimized cv::decolor by removing vector.push_back

* restored CV_INSTRUMENT_REGION() and original indent

* fix build warnings in contrast_preserve.hpp

* undo refactoring contrast_preserve.cpp/hpp

  * avoid misuse of vzeroupper on Visual Studio 2013 Update 5
  * add ifdef to avoid unattended optimization

- bgfg_segm
- peopledetect
- opencv_version
- dnn/colorization
- tapi/opencl_custom_kernel
- tapi/dense_optical_flow (renamed tvl1_optical_flow)

  * avoid aggressive optimization on Visual Studio 2012 Update 5
  * add code branch to avoid unattended optimization (keep the old code)

* SSE2 : use _mm_cvtpd_epi32 when converting from CV_64F to CV_32S

* No need to define a new universal intrinsic

* clean npr functions of useless initializations (speed-up)

* photo: remove unnecessary code