Allow global logging when developing

I'll be honest, for all I know logging should be global in general: it is
a pain to pass a logger to any struct that needs it. But smart people on the
internet tell me otherwise, and I do like the idea of not having any global
variables lying around.

Nonetheless, I often need to log things when locally debugging and that's a
different kind of logging than the kind you would include in the actual
released binary. For example if I want to log something from gocui, I would
rather not have gocui depend on lazygit's logging setup.

pkg/app/app.go

@@ -10,6 +10,7 @@ import (
 	"strings"
 
 	"github.com/go-errors/errors"
+	"github.com/sirupsen/logrus"
 
 	"github.com/jesseduffield/generics/slices"
 	appTypes "github.com/jesseduffield/lazygit/pkg/app/types"
@@ -22,6 +23,7 @@ import (
 	"github.com/jesseduffield/lazygit/pkg/env"
 	"github.com/jesseduffield/lazygit/pkg/gui"
 	"github.com/jesseduffield/lazygit/pkg/i18n"
+	"github.com/jesseduffield/lazygit/pkg/logs"
 	"github.com/jesseduffield/lazygit/pkg/updates"
 )
 
@@ -76,6 +78,18 @@ func NewCommon(config config.AppConfigurer) (*common.Common, error) {
 	}, nil
 }
 
+func newLogger(cfg config.AppConfigurer) *logrus.Entry {
+	if cfg.GetDebug() {
+		logPath, err := config.LogPath()
+		if err != nil {
+			log.Fatal(err)
+		}
+		return logs.NewDevelopmentLogger(logPath)
+	} else {
+		return logs.NewProductionLogger()
+	}
+}
+
 // NewApp bootstrap a new application
 func NewApp(config config.AppConfigurer, common *common.Common) (*App, error) {
 	app := &App{