* General: re-implementing network error handling
* Remove unreferenced dead code
* Minor modification in the update procedure. Removing the code part which updates the UI before the real check on new version. UI will be updated after the real check is done.
* [Runner] CheckForUpdatesCallback function and ID_REPORT_BUG_COMMAND case in tray_icon moved to threads.
* [Runner] Bool flag added to bug report thread.
* [Runner] Bool flag added to CheckForUpdatesCallback thread.
* [Runner] Review comments added. Uncessary mutex removed. compare_exchange_strong is used for atomic_bool variable checks.
