Add update check, upgrade dependencies and format code and change ver

assets.go

@@ -147,6 +147,9 @@ var failBytes []byte
 //go:embed assets/please_wait.gif
 var pleaseWaitBytes []byte
 
+//go:embed assets/update.png
+var updateBytes []byte
+
 // var clientAssets map[string]gdk.Paintabler = make(map[string]gdk.Paintabler)
 var clientAssets sync.Map
 
@@ -219,6 +222,7 @@ func init() {
 		"jabber":                jabberBytes,
 		"fail":                  failBytes,
 		"please_wait":           pleaseWaitBytes,
+		"update":                updateBytes,
 	} {
 		loadAsset(key, data)
 	}