A small update that brings a unified look and feel across the entire application and various UI improvements. 

- [NEW] About dialog UI refresh
- [NEW] Added a Ko-Fi link to the about dialog
- [NEW] Scrollbar added to the swatch list
- [NEW] New swatch dialog UI refresh
- [NEW] New library dialog UI refresh

If anyone finds this useful and has any feature requests I will try and find time to update the app.