* [staticcheck] Fix comments on exported functions and structs
* [ci] Improve staticcheck setup
- Add global staticcheck.conf file
- Ignore: at least one file in a package should have a package comment (ST1000)
- Ignore deprecation warnings. They are reported by golangci-lint and
there we have a proper way to exclude generated files.
Signed-off-by: Julian Strobl <jmastr@mailbox.org>