Retrieves the value of the specified property. Property names are case-sensitive.
If the property name provided is invalid or unsupported the engine should return
"<SAFS_NULL>".
The Android Engine also persists these values as SAFS variables.
^DroidEngine.Command = [command]
^DroidEngine.StatusCode = [statuscode string]
^DroidEngine.StatusInfo = [statusinfo]
See DEngineCommandProcessor.setStatusVars().