Results will be displayed in a message box - if we have a new version or
if we are running the latest version.
Update check at startup will show message box only once in 5 days, other
times it will be shown in the status bar. If we are already on latest
version, nothing is shown.
* Changed drone exit code from -1 to 1 'coz typically exit codes are
between 0 and 255
* Detect and report drone TCP port bind failure
* In all the following drone errors are reported (including previous
commits) -
* Drone already running (TCP port bind failure)
* Drone executable not found
* Packet.dll not found (Win32 only)
* The following conditions should NOT be reported
* Start/Stop Ostinato
* Stop before 5sec
* Stop after 5sec
