define runtime params in .cpp instead of *_declares.H

[zingale]

This fixes a potential ODR problem with *_declares.H, which is where we did the actual definition of the runtime parameters. Now we output a single runtime_params.cpp that has all of the runtime parameters defined in source instead of headers.

This also removes padding from the struct that we can alternately use for runtime params

PR summary

PR motivation

PR checklist

• [ ] test suite needs to be run on this PR
• [ ] this PR will change answers in the test suite to more than roundoff level
• [ ] all newly-added functions have docstrings as per the coding conventions
• [ ] the CHANGES file has been updated, if appropriate
• [ ] if appropriate, this change is described in the docs

[yut23]

We should sort namespaces as well, on line 139.

[zingale]

added the sort on namespaces

[zingale]

okay, I removed the redundant sorts