Draft: Improved vertexing

This MR aims utilise an incoming new truth vertex labelling and writer algorithm. It is still in early stages, but part of this is adding configurability to the existing TruthWriter. This draft MR is purely to check if the approach used for this is correct. This reconfigurability closes #148 (closed) , #150 (closed) .

Description

Review checklist:

• CI Passing
• Comments addressed
• Source branch is up to date with target

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• 5ee38915 - inial commit with configurable truth writer

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this looks awesome and long overdue

Hey @npond when do you think you can make a push to get this thing in? The ability to selectively write stuff in TruthWriter would be extremely useful (I'd thought about taking a stab myself but it's probably #7 or so on the "shit I should be doing" list).

If you were going to make a push in the next few days I'd probably hold off some other modifications that touch the same code (to prevent even more merge conflicts). Otherwise I'll just go ahead with some other changes.

yeah the rest of this MR is slightly longer term, so I'll separate it out and make a new MR over the weekend to include this in

Less work than expected, testing now, see !721 (merged)

@npond does this have anything worth keeping, or should we close it for now

When my vertexing code for athena is running, we need this MR as it introduces a new truth type 'truth_any' which is then all vertices - this will be at least a few weeks before I have a chance to finalize, so can close this if you want