Update "libtorrent" package to version 0.8.5 and "rtorrent" package

to version 0.4.5. Changes since 0.8.3 respectively 0.4.3:
- Bind udp and http tracker requests to the address given with the "bind"
  option.
- Change the priority of a torrent with the '+' and '-' keys.
- The schedule option allows clock time for the start and interval
  sections.
- Made it safe to remove torrents being viewed/selected, making
  "remove_untied" usable.
- Added the ^O key to change a closed torrent's destination directory. A
  bit of a hack, and only works if the torrents hasn't been activated.
- Allow new settings to be applied with the ^P key. This can be tested
  with "print = foobar", which prints the string to the log.
- Added the "working_directory" option that calls 'chdir' for the process.
- Fixed a bug that caused crashes with small screen sizes.
- Enabled a session lock file by default. Made it remove stale locks
  if the hostname matches and the process id is not running.
- Added proper abstraction for creating timers from seconds, this
  fixes some overflow bugs when scheduling tasks like tracker timeouts.
- For every time all the trackers in the list has been unsuccessfully
  tried, increase the timeout by 20 seconds.
- Expand ~ in paths in the client. This should cover all uses of file
  paths, but I might have missed some.
- Added "import" and "try_import" options that loads an option
  file. The latter silently fails on non-existent files.
- Added "-O" flag that takes a single option, allowing ',' to be used.

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