spawn a Mother actor

Signed-off-by: Sébastien Boisvert <sebastien.boisvert.3@ulaval.ca>
process boot signal

Signed-off-by: Sébastien Boisvert <sebastien.boisvert.3@ulaval.ca>
fix the next actor for the first actor

Signed-off-by: Sébastien Boisvert <sebastien.boisvert.3@ulaval.ca>