Added support for newer Symbian Os packages using extsis (plugin)

  Fixed batch mode not being enabled if directory is passed via command line
  Fixed some extracted files could be lost if moving the file/folder failed, thanks to patrickdrd
  Fixed problems with SuperDAT
  Changed drag and drop: when a folder is passed, all files in subfolders are added to batch mode as well (this can be disabled by adding batchrecurse=0 to section UniExtract Preferences in UniExtract.ini)

  Added progress to 'moving files' status text
  Fixed InstallShield Z archive extraction if file extension is not .Z
  Fixed 'Unknown extension' result window being displayed in silent mode
  Changed batch queue view: made window resizable

  Closes #153