Aribtrary commands

[adambrown1]

We have the nice functionality to send setpoints to devices, for example we use it for the cryocon. It would be great if we could also add additional commands for particular devices. For example, I would like a cryocon "stop" and "start" button corresponding to the relevant commands, and once we have them working we will need a scale "tare" command

[jarongrigat]

For cryocon example see cryocon_update. For the lanscales I have to think about it. Basically, we have the case that we want to control something that isn't read out as well. I guess, one could still use the current implementation but it might be better to come up with another way.
P.S. Of course, sending 'arbitrary' commands to a device is already possible via the Device modal or the command-tab in the sidebar. It's really more a question of how to 'make commands look like buttons'.