Qt4 - simplify the VideoWidget. VideoWidget is a just an simple QFrame with the necessary interactions...

services_discovery/sap.c: Make sure the thread will exit, even if in poll(). And properly lock the object.

include/vlc_objects.h: Use the usual macro trick, to publish a function that take as argument a vlc_object_t *, here for vlc_object_waitpipe().

(it does not find any error here)

 - Fix comments
 - Cache pagesize

Qt4 - Use a main instance of Sout for VLM. Clean DP since all dialogs (except Bookmarks that won't be done...) are done.