Nicolas Jager authored Sep 08, 2017 and Guillaume Roguez committed Sep 08, 2017

- CallbacksHandler recieves callbacks from the daemon (through legacy
lrc interfaces) and emits his own signals.

- Signals from CallbacksHandler have to be use only inside LRC.
It is not intended to connect those signals from a client.

- Until we rely on legacy lrc, CallbacksHandler will convert Qt
objects to STL equivalents.

Change-Id: I1f08279e5b432b995614ffc5e2b3daceddca1065
Reviewed-by: Guillaume Roguez <guillaume.roguez@savoirfairelinux.com>