Forward port of revision 16113. Fixes a bug in live555 module, that made audio packets (only for audio types that are not supported) being sent to the video decoder. This caused artefacts and segmentation faults in the decoder. VLC core handles the case for codec being not supported just fine, so removed the check for undefined codec.

add --snapshot-prefix and --snapshot-sequential options. --snapshot-prefix lets you choose the filename's prefix (default it "vlcsnap-"). --snapshot-sequential numbers the snapshot starting with 1 and incrementing every time.

* another patch for ffmpeg, so make up a new ffmpeg patch-file and ditch the previous configure-specific one

It would be nice if someone with more x264-knowledge could review this.

* yet another patch for ffmpeg: its configure script doesn't recognise that (at least on OSX) variables' names are case-sensitive

No need for a separate directory for 1 file

include/vlc/mediacontrol.h, src/control/mediacontrol_audio_video.c: implement get_/set_rate and get_/set_fullscreen

linux also (I do no quite know the current status, but it works for me this way at the moment).

* add "make nice" in modules to call ./compile

* malloc with NULL check
* file extension check
* check if a demux was forced
* try peeking, and check what we poke
* init standard demuxer fields
* create packetizers