[cmyth] 'Monitor' announcement. Close nicely connections.

- Choose announcement 'Monitor' for event connection to be not blocking.
- Send message 'DONE' before shutdown 'Playback' and 'Monitor' connection.
- Break loop on error in rcv_okay and rcv_feedback.
[mythtv-cmyth] Add ADDON_Announce
[mythtv-cmyth] ADDON announcement: OnSleep & OnWake

- Add Suspend/Resume/IsListening functions in event handler.
- Nicely suspend services on sleep: EventHandler, fileOps.
- Add IsBackendOK(notify?) to check backend status when need (on wakeup...).
- Check one time the backend status when starting operation. Remove useless.
- Check xbmc announcement OnSleep & OnWake and suspend or resume services.