[Feature Request]Two-Line Display, Custom Labels, Concise Mode

[1]Double-Line Text Display: Add an option to display the network speed text in two lines (e.g., upload speed on one line and download speed on the next) for better readability, especially on panels with limited horizontal space.

[2]Customizable Labels for Upload and Download: Allow users to customize the labels for upload (default: "↑:") and download (default: "↓:") speeds. This would enable personalized or localized symbols and text to suit user preferences.

[3]Concise Speed Format Option: Introduce a "concise mode" setting where users can choose a shorter format for speed display, such as "00 K/s" instead of the default "00 KBps", for a cleaner and more compact appearance.

These enhancements would make the plugin more flexible and user-friendly. Thank you for considering this request!