Pin firing delay for LabJackFake

[OliverBalfour]

The fake LabJack simulator class currently toggles pins with no delay, so when you start a sequence on a dev server the pin firing times in the UI are not realistic.

We should probably just sleep in the pin toggle and state reading functions an amount sampled from a normal distribution, where the mean and std dev are roughly similar to how long it takes with the real deal (this doesn't have to be anywhere near perfect, this is a total nitpick). This should take like 10 minutes

[OliverBalfour]

It turns out this is nontrivial for a few reasons

• The delay is not actually pin firing being slow, it's the websocket messages having higher ping from a raspberry pi than from a loopback (ie local dev) server
• If we add timing delays with time.sleep artificially, the broadcasts still bundle up after all the timers have finished because of a quirk of asyncio's ensure_future scheduling. This would work fine if we used asyncio.sleep but that requires we make the interface async

Overall not worth pursuing, so I'll close this