Various cleanups part 2

[Menduist]

ref #620

• [ ] Fix compilation warnings
  • [X] Unused imports
  • [ ] XDeclaredButNotUsed: use https://github.com/markspanbroek/upraises? Would swallow some useful warnings
• [ ] Try to remove as much exported procs & fields as possible
• [ ] Try to lower the recursive dependency count as low as possible

[arnetheduck]

one thing that helps manage both imports and circular is reexports - ie https://status-im.github.io/nim-style-guide/language.import.html

[Menduist]

This PR is quite outdated by now