Remove NewApp initializer

and move defaulting to `App.Setup`

command.go

@@ -164,10 +164,11 @@ func (c *Command) HasName(name string) bool {
 }
 
 func (c *Command) startApp(ctx *Context) error {
-	app := NewApp()
-	app.Metadata = ctx.App.Metadata
-	// set the name and usage
-	app.Name = fmt.Sprintf("%s %s", ctx.App.Name, c.Name)
+	app := &App{
+		Metadata: ctx.App.Metadata,
+		Name:     fmt.Sprintf("%s %s", ctx.App.Name, c.Name),
+	}
+
 	if c.HelpName == "" {
 		app.HelpName = c.HelpName
 	} else {