Add hexdump of HEVCVideoDescriptor

Add a hexdump of the HEVCVideoDescriptor in the debug output.
This can help in determining if the fields are presented correct
and it can help in determining the values of the fields that are not
yet fully decoded in the debug output.

mythtv/libs/libmythtv/mpeg/mpegdescriptors.cpp

@@ -836,6 +836,9 @@ QString AVCVideoDescriptor::toString() const
 
 QString HEVCVideoDescriptor::toString() const
 {
-    return QString("HEVC Video: ProfileSpace(%1) Tier(%2) ProfileIDC(%3)")
+    QString str = QString("HEVC Video: ProfileSpace(%1) Tier(%2) ProfileIDC(%3)")
         .arg(ProfileSpace()).arg(Tier()).arg(ProfileIDC());
+    str.append(" Dumping\n");
+    str.append(hexdump());
+    return str;
 }