LogsDownloaderWorker: Don't create objects that are not needed.
LogsDownloaderWorker: WIP better reaction for reset request.
LogsDownloaderWorker: WIP adding option to invalidate the download panel (for reseting).
LogsDownloaderWorker: Adding clear folders state icon to null on clear interface.
LogsDownloaderWorker: Reworked doReset(..) to use SwingWorker and better stop all downloads.