- Changed submit_log to False in calls to dump_log() relating
  to errors about not being able to contact the MASSIVE website.
- Ensured that global launcherMainFrame is defined at the
  beginning of the LauncherMainFrame class's init method,
  because it is used by dump_log which may be called before
  init() has completed.
- Removed references to loginThread from dump_log(), because
  dump_log may be called before login thread has commenced.
Merge branch 'master' of https://github.com/CVL-dev/cvl-fabric-launcher
- Removed all references to loginThread from dump_log(),
  because login thread might not have commenced yet.