Remove unused imports with solhint plus extra rules

[ernestognw]

Attempts to fix #4825. Added some rules I think may be fine

EDIT: As noted in #4825, enabling the rule would require multiple // solhint-disable no-unused-import lines. I think they're ugly so I re-scoped the PR to just remove those unnecessary imports I found

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Latest commit: 0a5f186

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[arr00]

We don't already have the no-unused-import rule and it's not added here?

[ernestognw]

We don't already have the no-unused-import rule and it's not added here?

No, I removed it in this commit: 0a5f186