This is to achieve a clean separation of concerns - the watchdog is an inappropriate place for work management.
Also adds a WorkManager.RunInThreadPool() class which feeds through to Util.FireAndForget.
Also switches around the name and obj arguments to the new RunInThread() and RunJob() methods so that the callback obj comes after the callback as seen in the SDK and elsewhere
Job engine is controlled via "debug jobengine start|stop|status".
Can only currently be enabled and disabled dynamically at runtime.
Currently only applies to code sending initial region data (objects, other avatar data) to a client.