listen to screensaver events in cectray. bugzid: 1375
fixed crash when CCECProcessor::Transmit was called after CCECProcessor::Close
fixed potential crash when SendCommand returns NULL
added ActivateSource action to cectray
guard against the screensaver failing to be activated. don't disconnect from libCEC when away mode is activated, but just send standby. bugzid: 1375
bump to 2.1.4