Remove new-from-rev from the linter (#1783)

* Fix all revive warnings in the code base

All of these are of the form

```
var Identifier Type = Expr
```

where the `Type` is known from the output of `Expr` and can be omitted
as a result.

* Handle unchecked errors

* Remove new-from-rev

Since the project passes all linter checks now, including older
revisions, we can remove new-from-rev. While here, reorder the linter
config file, and move the enabled linters up and settings down.

* Fix failing test cases

Studio & Performer export tests use local time rather than UTC. This
fixes the test cases so integration test
passes.

pkg/api/routes_image.go

@@ -59,7 +59,9 @@ func (rs imageRoutes) Thumbnail(w http.ResponseWriter, r *http.Request) {
 				logger.Errorf("error writing thumbnail for image %s: %s", img.Path, err)
 			}
 		}
-		w.Write(data)
+		if n, err := w.Write(data); err != nil {
+			logger.Errorf("error writing thumbnail response. Wrote %v bytes: %v", n, err)
+		}
 	}
 }