Allow future control toolbar to be hidden (default) or shown.

Allow future control toolbar to be hidden (default) or shown.

 Even if no control toolbar is implemented for ActiveX yet, we already
 provide the code to enable/disable it for compatibility with Firefox
 API behaviour.
 The getter used to know if toolbar is shown will always return FALSE
 until a toolbar is implemented. (getter which will be available soon
 for Firefox)

To use it:
- ActiveX global property named "toolbar":
   For HTML : <param name="toolbar" value="True" />

- API on IVLCControl2 interface, property "toolbar" (RW):
   For Javascript : yourvlcobject.toolbar = false;
                    isToolBarShown = yourvlcobject.toolbar;

Signed-off-by: Jean-Paul Saman <jpsaman@videolan.org>