Add option to have multiple lines

[cf73]

Thanks for the plugin! I'm trying to represent 'swimlanes' in a spiral diagram, i.e. a classic swimlanes diagram showing what different people are doing at the same time in a process, only in a spiral formation, as the process itself repeats. It would be incredibly helpful to have the option to choose the number of lines that get drawn, and have them drawn side-by-side with no gaps in between, so that I am then able to select each and color them to differentiate them. Ideally looking to make a spiral with three swimlanes running in parallel, each around 500px wide in terms of stroke weight. I can possibly do this by drawing multiple spirals, but they tend to overlap as the math is very hard to get just right; would be easier to do at the plugin level., Many thanks!!