* Add gocognit linter
* Remove gocognit to the golangci config
* Make changes on README.md
* Remove gocognit from megacheck benchtest
* Remove command line flags
* Comply with new style
Run all linters per package. It allows unloading package data when it's
processed. It dramatically reduces memory (and CPU because of GC) usage.
Relates: #337
Fix#324, relates #314
1. Update gocritic to the latest version
2. Use proper gocritic checkers repo, old repo was archived
3. Get enabled by default gocritic checks in sync with go-critic: don't
enable performance, experimental and opinionated checks by default
4. Support of `enabled-tags` options for gocritic
5. Enable almost all gocritic checks for the project
6. Make rich debugging for gocritic
7. Meticulously validate gocritic checks config
