Remove useless tests

Attempt to fix youtube demux script. I still get connections errors towards youtube but i wanted to commit what i'd already done since i'll be gone for a week.

Passes intf_thread_t* to Notify()
Uses newlines in the popup message

item-change etc. doesn't mix with currently playing item. Ain't so
pretty yet, so take one.

Also don't show same metadata button if not needed.

Hide the qt-adv-option as it is doing nothing

before handshake goes ok

See changeset details for rationale.

([1] VoD RTSP pretends to, but it does not, does it?)

media_list.c: Handle item addition and removal in the flat list. Also Get the media_list to init and release the flat media list.

- ffmpeg-skip-frames    values: -1=None, 0=Default, 1=B-frames, 2=P-frames, 3=B+P frames, 4=all frames
- ffmpeg-skip-idct	values: -1=None, 0=Default, 1=B-frames, 2=P-frames, 3=B+P frames, 4=all frame)

- Add option to force chroma.
- Add option to force aspect ratio.
- Add option to disable tty handling for systems where framebuffer and console are on different terminals.
- Fix memory leaks.

Remove an imbrication in XML parsing, again similar to freetype.c

with vlc_object_release(). Also copied across some Null pointer checks.

being too large in full screen for some video modules.

Fix memory leak by unrefing the GdkPixBuf