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

deps/deps.go

@@ -16,7 +16,6 @@ import (
 	"github.com/gohugoio/hugo/resource"
 	"github.com/gohugoio/hugo/source"
 	"github.com/gohugoio/hugo/tpl"
-	jww "github.com/spf13/jwalterweatherman"
 )
 
 // Deps holds dependencies used by many.
@@ -25,7 +24,7 @@ import (
 type Deps struct {
 
 	// The logger to use.
-	Log *jww.Notepad `json:"-"`
+	Log *loggers.Logger `json:"-"`
 
 	// Used to log errors that may repeat itself many times.
 	DistinctErrorLog *helpers.DistinctLogger
@@ -122,10 +121,6 @@ func (d *Deps) LoadResources() error {
 		return err
 	}
 
-	if th, ok := d.Tmpl.(tpl.TemplateHandler); ok {
-		th.PrintErrors()
-	}
-
 	return nil
 }
 
@@ -256,7 +251,7 @@ func (d Deps) ForLanguage(cfg DepsCfg) (*Deps, error) {
 type DepsCfg struct {
 
 	// The Logger to use.
-	Logger *jww.Notepad
+	Logger *loggers.Logger
 
 	// The file systems to use
 	Fs *hugofs.Fs