python-vlc: implement MediaPlayer.video_get_(size|width|height|cursor)
python-vlc: implement MediaPlayer.video_get_(size|width|height|cursor)

Signed-off-by: Olivier Aubert <6156ad34beef884227e9079455af537dce64089d@liris.cnrs.fr>

geoffsalmon/vlc-python,metakermit/vlc-bindings-python,oaubert/python-vlc,kermit666/vlc-bindings-python,oaubert/python-vlc,kermit666/vlc-bindings-python,pombreda/git.videolan.org-vlc-bindings-python,pombreda/git.videolan.org-vlc-bindings-python,metakermit/vlc-bindings-python,geoffsalmon/vlc-python