gui/design: add option to draw N-point stars, hollow or filled or inverted, and change the main axis to orient in any direction

[ryanbennitt]

gui/design

Add new option to draw N-point stars.

• The default has 5 points, use 'B'/'b' to increase/decrease points.
• They can be hollow or filled, and inverted.
• The next-point offset can be increased/decreased using 'N'/'n' which particularly affects 7 point stars and above to make them spikier or smoother, but can also be used to decrease to 1 to make symmetrical polygons or increase to N which only paints the vertexes.
• The orientation can be changed by adding a main axis point using 'v' and moving this to point in the desired direction.

[myk002]

This is 100% awesome!

The only issue I found (from play testing) is that the drawn lines can now exceed the bounding box. This is especially visible when Invert is on:

When thickness is increased, could the lines be made to expand towards the center?

[myk002]

nice choice

[myk002]

I think I'll approve this for now, and we can discuss the bulging issue on Discord