This patch makes some minor adjustments to the UI operation.

1) Add VLC Icons
2) Re-arrange Viewer / Library windows
3) Re-define some button names
4) Change some icons to improve clairity
5) Long press on Prev / Next buttons now seek back / forward

More to come later, including EQ, VLM UI, Maybe Mosaic.
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>