- drop hello-android sample

https://github.com/gradle/gradle/tree/v4.6.0

License: Apache 2.0

* conversions of color_rgb.cpp vectorized

* CL impl: coeffs updated

* unused constants removed

* CUDA color coeffs updated

broken in 11eafca3

* added performance test for compareHist

* compareHist reworked to use wide universal intrinsics

* Disabled vectorization for CV_COMP_CORREL and CV_COMP_BHATTACHARYYA if f64 is unsupported

Add ability to build iOS and macOS frameworks with nonfree modules (#13424)

* Allow building ios framework with nonfree

* Allow building osx framework with nonfree

* python: add checks for drawKeypoints() symbol

* python: more hacks in hdr_parser.py

On windows 7, MinCore_Downlevel does not work correctly. However, the only API used was QISearch, which can be found in Shlwapi.

Closes #12010

* Enable Javascript bindings for photo module.

1. Enable the build flag in build_js.py.
2. Append js into WRAP list of photo’s CMakefiles.txt
3. Add photo module's API into JS API whitelist (embindgen.py)

Exposing the HDR imaging part of photo module.

[TODO]
Add tests
Fix opencv/doc/js_tutorials/

* [WIP] TODO: Add tests

* Remove TonemapDurand: algorithm patented in US, so moved to opencv_contrib

* Fix ningxin's comment: expose the base class.

* Add some more simple binding tests.

Also expose process function

* try to solve #13381

* Add note

* Added dependency verification mechanism for cmake

moved to CMakeFiles (no conflicts are expected)