Refactor v5

[joloppo]

Overview

• Refactor according after discussions with @matteo-pallini last month.
• I had to add the custom inject back in, rather than using .format as .format requires all variables to be formatted (could use std templates but that would change the syntax to $).
• Validation now happens in the attached serde.

[matteo-pallini]

Left a bunch of comments. Most of them are nitpicks, so feel free to ignore them. Probably there is just 3 that I think it's definitely worth addressing:

• removing commented out code and some if __name__ == __main__ switches in some modules
• this comment https://github.com/VorTECHsa/dynamicio/pull/64/files#r1321512710
• this comment https://github.com/VorTECHsa/dynamicio/pull/64/files#r1321623019

Also, two other general comments:

• I don't understand most of what is going on in the hdf.py module. So, if you want me to review that too it may be worth having a quick chat, and then I will need to spend a bit of time on that
• Given that we spent quite a bit of time discussing about the refactoring design it may be worth also having someone else reviewing it. As, I am probably not in a good position to give you unbiased feedback on that

[joloppo]

I've amended the PR - I left conversations I want you to have a look at open. Feel free to resolve them.

[matteo-pallini]

It's a lot of changes, so maybe not everything will work perfectly on the first iteration but I think it's a step in the right direction. Thanks for doing this work, approved. As mentioned already, it may be worth having also another codeowner reviewing it, as it's a big change and I contributed to the design choices, so I am biased :-)