Rewritten some tests in videoio and imgcodecs modules

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

modules/ts/src/ts_func.cpp

@@ -2947,9 +2947,9 @@ MatComparator::operator()(const char* expr1, const char* expr2,
     return ::testing::AssertionFailure()
     << "too big relative difference (" << realmaxdiff << " > "
     << maxdiff << ") between "
-    << MatInfo(m1) << " '" << expr1 << "' and '" << expr2 << "' at " << Mat(loc0) << ".\n\n"
-    << "'" << expr1 << "': " << MatPart(m1part, border > 0 ? &loc : 0) << ".\n\n"
-    << "'" << expr2 << "': " << MatPart(m2part, border > 0 ? &loc : 0) << ".\n";
+    << MatInfo(m1) << " '" << expr1 << "' and '" << expr2 << "' at " << Mat(loc0).t() << ".\n"
+    << "- " << expr1 << ":\n" << MatPart(m1part, border > 0 ? &loc : 0) << ".\n"
+    << "- " << expr2 << ":\n" << MatPart(m2part, border > 0 ? &loc : 0) << ".\n";
 }
 
 void printVersionInfo(bool useStdOut)