Added timer tests.
Time tests passes.
Flu class now embedding a timer.
Multicast got broadcasting tests.
Assets and managers connected, reception now private everywhere.
Assets and managers connected in broadcast mode.
Stages can add cameras, no compilation.
Stage events and camera destructor implemented.
Assets now disconnects from managers to avoid a segfault.
Implemented a stub to start a Flu with a stage.
Compilation error fixed.