v4l-utils: add default mapping for XBOX-One remote support (protocol needs still to be changed to 'NEC' manually until we found a automatic solution)

Signed-off-by: Stephan Raue <stephan@openelec.tv>
v4l-utils: automatically load NEC protocol with rc6_map file, so XBOX-One remote is working ootb

Signed-off-by: Stephan Raue <stephan@openelec.tv>
vdr-addon: add option to override epg charset
tvheadend: update to tvheadend-3.9.681