silverwind 74f0c84fa4
Enable more `revive` linter rules ()
Noteable additions:

- `redefines-builtin-id` forbid variable names that shadow go builtins
- `empty-lines` remove unnecessary empty lines that `gofumpt` does not
remove for some reason
- `superfluous-else` eliminate more superfluous `else` branches

Rules are also sorted alphabetically and I cleaned up various parts of
`.golangci.yml`.
..
v70.go Replace `interface{}` with `any` ()
v71.go Enable more `revive` linter rules ()
v72.go Rename `Sync2` -> `Sync` ()