DataMatrix: add bunch of new blackbox 'real world' test images

These images show/test the advantage of the 'new' DMDetector. Almost all
of them would have failed with the original/upstream detector code.

Author: axxel

test/blackbox/BlackboxTestRunner.cpp

@@ -296,6 +296,13 @@ int runBlackBoxTests(const fs::path& testPathPrefix, const std::set<std::string>
 			{  0, 18, 270 },
 		});
 
+		runTests("datamatrix-3", "DATA_MATRIX", 19, {
+			{ 18, 19, 0   },
+			{  0, 19, 90  },
+			{  0, 18, 180 }, // 1 fail because of a different binarizer output
+			{  0, 19, 270 },
+		});
+
 		runTests("codabar-1", "CODABAR", 11, {
 #ifdef ZX_USE_NEW_ROW_READERS
 			{ 11, 11, 0   },

test/samples/datamatrix-3/OldDetectorFallback.jpg

@@ -0,0 +1 @@
+Hello World

test/samples/datamatrix-3/OldDetectorFallback.txt

@@ -0,0 +1 @@
+A12206200417:02:38

test/samples/datamatrix-3/dm-0.jpg

@@ -0,0 +1 @@
+WUPV001DS81KA123

test/samples/datamatrix-3/dm-0.txt

@@ -0,0 +1 @@
+http://datamatrixcode.net