(fixes a crash with mono streams)

Improve non-handling by interfaces without interaction

Dirty currently ... 

* Handle interfaces not providing interaction correctly
* Add a new helper to request authentication
* Add return codes

directx.c: fixed the initial grey flicker when using overlay surfaces by postponing painting the overlay colorkey until the first picture has been received the vout display

 using vlc_object_id instead of a direct p_object pointer as parameter
 for mediacontrol_new_from_object