Implement the preferred video resolution

Description

See: https://forum.videolan.org/viewtopic.php?f=35&t=156819

It can be added by using the following libvlc option:

--preferred-resolution={-1 (Best available), 1080 (Full HD (1080p)), 720 (HD (720p)), 576 (Standard Definition (576 or 480 lines)), 360 (Low Definition (360 lines)), 240 (Very Low Definition (240 lines))} 
                                 Preferred video resolution