xbmc: update to xbmc-14-31ce987

Signed-off-by: Stephan Raue <stephan@openelec.tv>
projects/RPi/patches/xbmc: update RPi support patch

Signed-off-by: Stephan Raue <stephan@openelec.tv>
[xbmc-rebrand] xbmc: rename all variables '$XBMC*' to '$KODI*'

Signed-off-by: Stephan Raue <stephan@openelec.tv>
[xbmc-rebrand] libcec: rename all variables '$XBMC*' to '$KODI*'

Signed-off-by: Stephan Raue <stephan@openelec.tv>
[xbmc-rebrand] libc: rename all variables '$XBMC*' to '$KODI*'

Signed-off-by: Stephan Raue <stephan@openelec.tv>
[xbmc-rebrand] mediacenter: rename all variables '$XBMC*' to '$KODI*'

Signed-off-by: Stephan Raue <stephan@openelec.tv>
[xbmc-rebrand] config/*: rename all variables '$XBMC*' to '$KODI*'

Signed-off-by: Stephan Raue <stephan@openelec.tv>
[xbmc-rebrand] projects/*/options: rename all variables '$XBMC*' to '$KODI*'

Signed-off-by: Stephan Raue <stephan@openelec.tv>