Improve conversion of complex closed paths

[Dave Stewart]

Background

Right now outlining paths uses makerjs.model.outline but this doesn't seem to work on closed paths containing other paths.

The workaround is to make sure paths don't contain other closed paths.

However, the docs demonstrates a way round this using a wireframe technique.

Additionally, chains look like they would be worth investigating.

Proposal

Implement the wireframe technique and test.

Look at chains and see if they would help to solve issues around fill rules.

Notes

See:

• https://maker.js.org/docs/advanced-drawing/#Wireframe%20technique
• https://maker.js.org/docs/advanced-drawing/#Open%20vs%20Closed%20Geometry
• https://maker.js.org/docs/advanced-drawing/#Outlining%20a%20model
• https://maker.js.org/docs/advanced-drawing/#Expanding%20paths