Add “accent strip” preview display option

[ShtokyD]

Would be very nice to have a button to toggle between “Accent strip” and “Blade strip” preview display option for the top most pixel animation window. And add custom number of pixels for both preview options.
For the “Accent strip” preview would be a good idea also to make 2 options: “line” and “circle”. And for the “circle” to have 2 options: “1 circle” and “2 circles one inside the other” (for example NPXL V3 connector has 2 circles of pixels running in a zig-zag order), and to have different preview appearance for all these options.
All this will have to better visualize and test the pixel animation before uploading to the board.

[NoSloppy]

I thought maybe multiple style boxes on the same page so it could show what everything does together.
Something like this: