Now showing filesize of downloaded file

 * Before filesize has only been shown while downloading
   now it will be shown even after the download has
   finished
Stopped using cat

 * Now I use QProcess::setStandardInputFile to supply
   mplayer with streamed data...

 TODO:
 * I should replace the current way of streaming with
   a more sophisticated one: automatically suspending
   mplayer if no data is available...
Added some parameters for more flexibility

 * mplayer and file path can now be configured
   on module level. Still not implemented in the
   application.
Implemented new wget mode

 * wget can be used to download streams.