ensure that the tray app only initialises once. bugzid: 2082
fixed index out of range exception in CECSettingNumeric.cs. bugzid: 2082
send an alert when the TV does not respond to polls
LibCecSharp: fixed return value of GetActiveDevices(). issue #131
always poll a device when the status is unknown, and don't try to determine whether it needs to be polled by checking the status of other devices
LibCecSharp: fixed 14 char long OSD name (wasn't \0 terminated)