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This handles the effect representation in the timeline.
It currently can't be resized nor moved, or anything else.

AS the TracksView will soon handle non clip GraphicsItems.
More methods have been moved from the AbstractGraphicsMovieItem class to the
AbstractGraphicsItem class.

This intend to ease the development of a new GraphicsEffectItem.

This prevents the dialog from staying opened with the application
closed.

Some of the strings are computed by frei0r using std::string::c_str()
which is not guaranteed to live though the whole program's life time.

It caused the application to hang on exit.

QColor constructor takes color composant in the [0;255] range.

This adds thread safety, and prepare the effect addition, as we now can
add an effect without having to care if the EffectUser is rendering or
not, since its handled internally.

Effects are now handled by an EffectUser class. This class handle
loading, saving, adding, initializing and applicating of any effect that
will be added to a class that inherits EffectUser.

This will avoid too many copies when dealing with GUI.