Update protobuf submodule

Signed-off-by: Jan Losinski <losinski@wh2.tu-dresden.de>
Add basic message worker prototype

Signed-off-by: Jan Losinski <losinski@wh2.tu-dresden.de>
Add simple test for message prototype

Signed-off-by: Jan Losinski <losinski@wh2.tu-dresden.de>
Add the messages build dir to ycm includes

Signed-off-by: Jan Losinski <losinski@wh2.tu-dresden.de>