add config for studying ecal resolution

[tomeichlersmith]

This is an re-opening of a submodule PR (https://github.com/LDMX-Software/Ecal/pull/50) where I followed the instructions to re-apply my changes in one commit onto the subdirectory.

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I am updating ldmx-sw, here are the details.

I've copied this config around for awhile so it is time to put it into the repository.

This config is focused on firing electrons directly into the ECal and then running the various processors that emulate electronics and reconstruct stuff within the ECal so users can then analyze the output.

To Do

• [x] Compare module-level sum between trigger primitives and precision rec hits
• [ ] Compare trigger primitives to trigger-group-sum of precision rec hits
• [ ] Write a processor that re-calculates the trigger primitives using the precision rec hits. This allows us to see how imprecise the trigger primitive "condensation" algorithm is.

[tvami]

The denv changes seem to have been also added to this PR.

If you need help with the TODO, there is somebody at UCSB who is looking for a project. This also means that it wont be done very quickly, so if it's urgent then maybe not the best thing to give him.

[tomeichlersmith]

Thanks :+1: I was being too quick with creating new branches!

We already have a grad student here at UMN working on this (not sure on his GitHub username right now), so no need to give it to the UCSB student.