TPR trigger channel, top level object, screens

[slactjohnson]

Current Behavior

We don't have anything for the TPR.

Expected Behavior

We should have support for the TPR equivalent to that of the EVR.

Context / environment

I have numerous devices that will require TPRs soon. So will lots of other people.

Suggested Solution

We should provide support equal to what is described in #1118 for the TPR.

There's also a question of how do we deal with timing changing sources? Maybe this is done in the IOC and we don't have to worry? I haven't inspected the TPR IOC yet, and have only briefly played with one, so I don't quite know how this should be done yet. Bruce's EDM screens currently allow you to choose what type of timing you're using, and the screen updates appropriately. We will eventually need the same functionality in PyDM and the TPR class.

/end confused rambling

[ZLLentz]

Requested again by James in https://jira.slac.stanford.edu/browse/ECS-3903

[ZLLentz]

Adding Kaushik to match the Jira assignment

[slactjohnson]

@KaushikMalapati can we close this now? I think your PR has been merged, right?

[KaushikMalapati]

@KaushikMalapati can we close this now? I think your PR has been merged, right?

It has been, #1178.