This change attempts to make calls to WII_IPC_HLE_Interface::Update()
more consistent. We should be calling it whenever there is something we
can pop from a queue, and this patch does that.
DeviceUpdate() now works independently of Update(): it's now just a periodic
timer for devices which need to regularly update state.
With this change, we need a non-zero default delay for IPC replies because
replies are popped off the queue much more aggressively.
This fixes launching channels from the the System Menu.