Enable the whitespace linter and fix the errors resulting from it.
Also:
* Remove unneeded golangci-lint config for disabled linters.
* Correct test number for panic in previous commit.
Leverage github actions for tests and linting.
This includes fixing a bunch of issues highlighted by golangci
including:
* Dead code.
* Ineffectual assigns.
* Goto warnings.
* Nil return err.
* Reused literal strings.
* Test parameter order.
Also:
* Setup clog.
