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This has only be tester with a Clip end date, not with an "unset" Clip
end.
Removed debug.

The Main/Tracks workflow remains really basic...

There's still a size/chroma/pitch/something_else problem, but this should work
soon :)

It just lacks a few graphic polish (for the sliders)

This seems to breaks a few things (or at least I observed crash that didn't
occured before, but maybe that's VLC 1.1 :D

Corrected crash when launching
Added render preview widget in UI
Deleted unused VLCMediaList

Corrected Clip workflow, seems kinda functionnal, but will need more
testing...

VLC config files aren't loaded anymore. ("--ignore-config")

Library is now made of a GUI representation, and a frontend/backend,
that communicate with slots/signals
Also, VLCException must now be catched using the macro
CheckVlcppException, so that it prints out file and line of the error.

Please do not use 'this' pointer when it isn't required.