export messages headers

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

Signed-off-by: Jan Losinski <losinski@wh2.tu-dresden.de>
Add basic unittests to test the message wrappers

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