Pattern customization #56
Description
As the title says, the current Pattern is fixed
Perhaps we could add a custom Pattern feature, while also supporting Pattern import and export.
A new title bar named "Custom" can be added in Select Pattern.
Allow users to draw their own pattern on an n*7 canvas, only allowing single color (n cannot exceed 52), and then save it to the custom tab.
This makes it easier to reuse the pattern.