May fix builtins recompilation (theora, flac...)

(this commit obviously breaks binary compatibility - clear your plugins)

* new psychedelic FOSDEM demo filter. enjoy :)
* misc changes          

tree configuration is modified

as it did never worked properly, if at all with these
(you should use libtool to build a shared libvlc instead)

- accessible by double-clicking on the time-counters and through a menu-item in "Playback"
- the class of the time-counters is VLCTimeField now, because we need to fetch the mouseDown-event. There are no further changes compared to NSTextField.

Add toggle_mute

to fix that.