Task and thread priority for IoDispatcher decompressionArguments are three characters: [ThreadPriority][TaskPriority][TaskPriorityIfForcedToNormalThreadPriority] where ThreadPriority is 'h' or 'n' or 'b' (high/normal/background) and TaskPriority is 'h' or 'n' (high/normal). Example: TaskGraph.TaskPriorities.IoDispatcherAsyncTasks bnh
