[Class] ManualWorkflowSchedulerService [Description] 
Obsolete. Provides a threading service that allows the host application creating a workflow instance to donate the Thread on which the workflow instance is run. Using this threading service, host applications can run a workflow instance on a single Thread in synchronous mode (although if the workflow contains a delay activity, the work is postponed until after the delay activity is executed on a separate thread spawned by [System.Threading.Timer]).This mode blocks the execution of the host application until the workflow instance becomes idle. Subsequently, the workflow instance can only be executed using the RunWorkflow method of this service.