misc minor refactoring

[vicb]

Supersedes #1238

@314systems I have extracted a few "safe" changes from your PR.

I guess some of the changes there might not be compatible with the minimum version of TS from package.json.
So it would take a long time to check every single change.

I also don't think there is a urge to change working code when there is no clear benefit / readability gain. We can change the code when we have to update it for other reason. We don't have unlimited resources to work on this project and allocating them to higher priority bug fixes / features is a better thing to do IMO.

Thanks!

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[vicb]

Thanks for the review James!