Video: implementation of the keyboard basic controls

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>
Video: add mute control from keyboard

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>
UI: Cosmetic fixes when some elements are focused

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>
Video player: modify focus behavior for keyboard navigation

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>
Build: add gnu-libstdc++ in EXTRA_LDFLAGS

fix protobuf build.

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>
libiomx: move iomx_hwbuffer.cpp to nativewindowpriv.c

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>