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There is now an android logger module in vlc.

- 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.

They are now not translatable.

There is a new audiotrack module that use AudioTrack API by JNI.
Use it per default because of the problems we have with Open Sles.

AudioTrack (Java) and AudioTrack (Native) are now merged.

VersionCode automatically set according to platform (tablet/TV/Chrome) and ABI

vlc_entry__ symbols are not necessarily named like the .a file, so use nm to
find the good symbol.

This reverts commit bdf35efd.