switch message format submodule to openxc/messagepackadditions
switch message format submodule to openxc/messagepackadditions

openxc/vi-firmware,ene-ilies/vi-firmware,ene-ilies/vi-firmware,ene-ilies/vi-firmware,openxc/vi-firmware,ene-ilies/vi-firmware,openxc/vi-firmware,openxc/vi-firmware