Reenable dvdcss which was disabled accidently in [16806]. Fix the dvdnav patch to make dlopen configure check work

Compile fix

Thanks to courmisch for finding the issue
Closes #721

Fix a _() that should have been N_()
Username & Password are non-advanced settings
Warn user with interaction if Username is bad or not set
Handshake only if there is something to submit
Get rid of hexa() for printf("%02x")
Replace % 256 and / (2^x) by bitwise operations : & 0xff and >> x
Don't cancel submission of song if user has paused playing
Code for new meta_engine (not enabled yet)

Enable WavPack decoding in ffmpeg (once they'll increment the version number). Some of the samples still decode weird but hey ... it's already great news :)

longer does.

- revert 16847, this breaks the activex and mozilla plugins, and passing a argv[0] is a very desirable feature as the path in argv[0] is also used to search for plugins. Typically users can pass on the argv[0] of their programs

time unit

Make update-po

prepend argv[0] to libvlc_new parameters

mediacontrol_new API

that users of the API can simply pass parameters

 * Secondary queue items now have a b_fetch_art flag
 * You can use the playlist_AskForArtEnqueue function to ask for art from an interface. This will enqueue at the begining of the secondary queue
 * other stuff which i don't remember :)
 * (fix issues with previous (and unrelated) DIR_SEP commit)