libroot: added ability to communicate with the launch_daemon.

* These methods don't really work yet, as BMessage doesn't support
replying with a KMessage; the request is received, but the reply

libroot: added ability to communicate with the launch_daemon.

* These methods don't really work yet, as BMessage doesn't support
replying with a KMessage; the request is received, but the reply
never gets to the target.

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