Add name to threads

This help identifying threads when debugging.
The naming scheme is using 'class/function name + variable name'.
Note that the length limitaion is 16 chars on linux. On Windows, the limit is 32767 chars.

PR #21403.

src/base/rss/rss_session.cpp

@@ -90,6 +90,7 @@ Session::Session()
 
     m_itemsByPath.insert(u""_s, new Folder); // root folder
 
+    m_workingThread->setObjectName("RSS::Session m_workingThread");
     m_workingThread->start();
     load();