Fix Non-square Radiance/RGBE/.hdr images failing to load

The HDR QImageIOHandler plugin only supports the default image orientation (-Y +X) in .hdr files. It mixes up the width and height however, resulting in non-square images not loading.

This fix adds a check for the standard image orientation in the file and returns false (with error message) if that fails.
If it succeeds, it takes the height from the -Y component, and the width from the +X component, resulting in successful loading of the image.

Add autotest images for landscape and portrait HDR (Radiance RGBE) loader

BUGS: 433877

src/imageformats/hdr.cpp

@@ -227,8 +227,15 @@ bool HDRHandler::read(QImage *outImage)
         qCDebug(HDRPLUGIN) << "Invalid HDR file, the first line after the header didn't have the expected format:" << line;
         return false;
     }
-    const int width = match.captured(2).toInt();
-    const int height = match.captured(4).toInt();
+
+    if ( (match.captured(1).at(1) != u'Y') ||
+         (match.captured(3).at(1) != u'X') ) {
+        qCDebug(HDRPLUGIN) << "Unsupported image orientation in HDR file.";
+        return false;
+    }
+
+    const int width = match.captured(4).toInt();
+    const int height = match.captured(2).toInt();
 
     QDataStream s(device());