commands: Show server error info in browser

The main item in this commit is showing of errors with a file context when running `hugo server`.

This can be turned off: `hugo server --disableBrowserError` (can also be set in `config.toml`).

But to get there, the error handling in Hugo needed a revision. There are some items left TODO for commits soon to follow, most notable errors in content and config files.

Fixes #5284
Fixes #5290
See #5325
See #5324

hugolib/alias.go

@@ -22,12 +22,12 @@ import (
 	"runtime"
 	"strings"
 
+	"github.com/gohugoio/hugo/common/loggers"
+
 	"github.com/gohugoio/hugo/output"
 	"github.com/gohugoio/hugo/publisher"
 	"github.com/gohugoio/hugo/tpl"
 
-	jww "github.com/spf13/jwalterweatherman"
-
 	"github.com/gohugoio/hugo/helpers"
 )
 
@@ -47,11 +47,11 @@ func init() {
 
 type aliasHandler struct {
 	t         tpl.TemplateFinder
-	log       *jww.Notepad
+	log       *loggers.Logger
 	allowRoot bool
 }
 
-func newAliasHandler(t tpl.TemplateFinder, l *jww.Notepad, allowRoot bool) aliasHandler {
+func newAliasHandler(t tpl.TemplateFinder, l *loggers.Logger, allowRoot bool) aliasHandler {
 	return aliasHandler{t, l, allowRoot}
 }