* if the src has odd number of height, access error happens
  * it could happen on width, too
  * check both dst and src range in both width and height

* fix #12012

* Replace CV_StsBadFlag with Error::StsBadFlag

Avoids passing -Wall, which will enable literally every warning in
Clang. Avoids passing -ffunction-sections etc to clang-cl, which each
generate warnings.

- to avoid multiple conditional calls via sub_group() functions

The `codec_tag` is only available when opening a file from disk. If `AVStream` is a network stream then `fourcc` must be obtained using `codec_id`. I have tested the following scenarios:
1) Open a `.mp4` file and verify that `codec_tag` is returned (old behavior)
2) Open a `rtsp` stream and verify that `codec_fourcc` is returned (Tested with a MJPEG, H264 and H265 stream)

  * avoid race condition

Update hog.cpp (#12649)

- avoid memory access violation during "prefetch" stage

This commit fixes an issue while trying to compile
on s390x architecture.

This is simply a backport of a fixe already applied
in official protobuf code:
- https://github.com/protocolbuffers/protobuf/pull/3955

TS: fix Python v2/v3 compatibility (#12667)

* TS: fix Python2.7 compatibility

* TS: fix Python3 compatibility

* py3: use integer division '/' => '//' instead of cast

  especially if it matches the module being tested

  * follow the implementation of Luv2RGBfloat in imgproc/src/color_lab.cpp
  * loosen threshold in cudaimgproc