general:
- all iterative tests have been replaced with parameterized tests
- old-style try..catch tests have been modified to use EXPECT_/ASSERT_ gtest macros
- added temporary files cleanup
- modified MatComparator error message formatting

imgcodecs:
- test_grfmt.cpp split to test_jpg.cpp, test_png.cpp, test_tiff.cpp, etc.

videoio:
- added public HAVE_VIDEO_INPUT, HAVE_VIDEO_OUTPUT definitions to cvconfig.h
- built-in MotionJPEG codec could not be tested on some platforms (read_write test was disabled if ffmpeg is off, encoding/decoding was handled by ffmpeg otherwise).
- image-related tests moved to imgcodecs (Videoio_Image)
- several property get/set tests have been combined into one
- added MotionJPEG test video to opencv_extra

- cmake dependencies search (WITH_MFX option)
- raw H264, H265, MPEG2 encoding and decoding
- tests for supported formats

"Eat" unexpected backend exceptions

- Allows using non-default device names such as /dev/v4l/by-path/pci-0000:00:1d.0-usb-0:1.1:1.0-video-index0

The provided interface id must be removed from the index. Otherwise, the
underlying implementations are using a wrong camera id.

Example:
VideoCapture(800) fails because PvAPI tries to open a camera
on position 800

it provides more expectable results to end-users.
based on feedback by Alexander Alekhin

a separate function instead of an overload not to change the ABI.

rename VideoCapture paramter 'device' to 'index' in CPP to reflect that
it allows specifying the API.
update comments to explain how to specify the API.

Signed-off-by: Maxim Kostin <v-maxkos@microsoft.com>

Signed-off-by: Maxim Kostin <v-maxkos@microsoft.com>

fixed mjpeg encoder so that libjpeg-based decoder does not complain on extra bytes in the end of stream

std::streams removed

debug code removed

whitespaces removed

stdint.h added and trailing whitespaces removed

trailing whitespaces removed

warnings on windows fix

warnings on windows fix pt 2

Refactoring performed: AviMjpegStream class introduced. CAP_PROP_FRAME_WIDTH and CAP_PROP_FRAME_HEIGHT properties support added.

Windows warnings & uninitialized variable fix

Windows warning fix

Win32 warning fix

added video writer quality, which user may change dynamically in the case of motion jpeg; enabled NEON intrinsics in the encoder

Implement VideoCapture::get, CvCapture::getProperty, IVideoCapture::getProperty as constant methods.