- Remove dependency to LibVLC log stuff.

- Use a thread (via Logcat class) in a service: that way, logs are not lost and
  are always updated.

- Run the service in a separate process: it's not killed if VLC crashes.

- Use a ListView to show the logs: easily scrollable.

- Add a button to save the log in sdcard.

- There is a notification to notify that logs are being recorded, and to access
  the logs.